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标题:谁能解这段javascript代码?
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wanution
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谁能解这段javascript代码?
程序代码:
/*

 * jQuery 1.1.2 - New Wave Javascript

 *

 * Copyright (c) 2007 John Resig ()

 * Dual licensed under the MIT (MIT-LICENSE.txt)

 * and GPL (GPL-LICENSE.txt) licenses.

 *

 * $Date: 2007-02-27 17:18:47 -0500 (Tue, 27 Feb 2007) $

 * $Rev: 1460 $

 */

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搜索更多相关主题的帖子: javascript 代码 
2008-08-21 13:56
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程序代码:
/* prevent execution of jQuery if included more than once */
if(typeof window.jQuery == "undefined") {
/*

 * jQuery 1.1.2 - New Wave Javascript

 *

 * Copyright (c) 2007 John Resig ()

 * Dual licensed under the MIT (MIT-LICENSE.txt)

 * and GPL (GPL-LICENSE.txt) licenses.

 *

 * $Date: 2007-02-28 12:03:00 -0500 (Wed, 28 Feb 2007) $

 * $Rev: 1465 $

 */

// Global undefined variable
window.undefined = window.undefined;

/**

 * Create a new jQuery Object

 *

 * @constructor

 * @private

 * @name jQuery

 * @param String|Function|Element|Array<Element>|jQuery a selector

 * @param jQuery|Element|Array<Element> c context

 * @cat Core

 */
var jQuery = function(a,c) {
    // If the context is global, return a new object
    if ( window == this )
        return new jQuery(a,c);

    // Make sure that a selection was provided
    a = a || document;
    
    // HANDLE: $(function)
    // Shortcut for document ready
    if ( jQuery.isFunction(a) )
        return new jQuery(document)[ jQuery.fn.ready ? "ready" : "load" ]( a );
    
    // Handle HTML strings
    if ( typeof a  == "string" ) {
        // HANDLE: $(html) -> $(array)
        var m = /^[^<]*(<(.|\s)+>)[^>]*$/.exec(a);
        if ( m )
            a = jQuery.clean( [ m[1] ] );
        
        // HANDLE: $(expr)
        else
            return new jQuery( c ).find( a );
    }
    
    return this.setArray(
        // HANDLE: $(array)
        a.constructor == Array && a ||

        // HANDLE: $(arraylike)
        // Watch for when an array-like object is passed as the selector
        (a.jquery || a.length && a != window && !a.nodeType && a[0] != undefined && a[0].nodeType) && jQuery.makeArray( a ) ||

        // HANDLE: $(*)
        [ a ] );
};

// Map over the $ in case of overwrite
if ( typeof $ != "undefined" )
    jQuery._$ = $;
    
// Map the jQuery namespace to the '$' one
var $ = jQuery;

/**

 * This function accepts a string containing a CSS or

 * basic XPath selector which is then used to match a set of elements.

 *

 * The core functionality of jQuery centers around this function.

 * Everything in jQuery is based upon this, or uses this in some way.

 * The most basic use of this function is to pass in an expression

 * (usually consisting of CSS or XPath), which then finds all matching

 * elements.

 *

 * By default, if no context is specified, $() looks for DOM elements within the context of the

 * current HTML document. If you do specify a context, such as a DOM

 * element or jQuery object, the expression will be matched against

 * the contents of that context.

 *

 * See [[DOM/Traversing/Selectors]] for the allowed CSS/XPath syntax for expressions.

 *

 * @example $("div > p")

 * @desc Finds all p elements that are children of a div element.

 * @before <p>one</p> <div><p>two</p></div> <p>three</p>

 * @result [ <p>two</p> ]

 *

 * @example $("input:radio", document.forms[0])

 * @desc Searches for all inputs of type radio within the first form in the document

 *

 * @example $("div", xml.responseXML)

 * @desc This finds all div elements within the specified XML document.

 *

 * @name $

 * @param String expr An expression to search with

 * @param Element|jQuery context (optional) A DOM Element, Document or jQuery to use as context

 * @cat Core

 * @type jQuery

 * @see $(Element)

 * @see $(Element<Array>)

 */

 
/**

 * Create DOM elements on-the-fly from the provided String of raw HTML.

 *

 * @example $("<div><p>Hello</p></div>").appendTo("body")

 * @desc Creates a div element (and all of its contents) dynamically, 

 * and appends it to the body element. Internally, an

 * element is created and its innerHTML property set to the given markup.

 * It is therefore both quite flexible and limited. 

 *

 * @name $

 * @param String html A string of HTML to create on the fly.

 * @cat Core

 * @type jQuery

 * @see appendTo(String)

 */

/**

 * Wrap jQuery functionality around a single or multiple DOM Element(s).

 *

 * This function also accepts XML Documents and Window objects

 * as valid arguments (even though they are not DOM Elements).

 *

 * @example $(document.body).css( "background", "black" );

 * @desc Sets the background color of the page to black.

 *

 * @example $( myForm.elements ).hide()

 * @desc Hides all the input elements within a form

 *

 * @name $

 * @param Element|Array<Element> elems DOM element(s) to be encapsulated by a jQuery object.

 * @cat Core

 * @type jQuery

 */

/**

 * A shorthand for $(document).ready(), allowing you to bind a function

 * to be executed when the DOM document has finished loading. This function

 * behaves just like $(document).ready(), in that it should be used to wrap

 * other $() operations on your page that depend on the DOM being ready to be

 * operated on. While this function is, technically, chainable - there really

 * isn't much use for chaining against it.

 *

 * You can have as many $(document).ready events on your page as you like.

 *

 * See ready(Function) for details about the ready event. 

 * 

 * @example $(function(){

 *   // Document is ready

 * });

 * @desc Executes the function when the DOM is ready to be used.

 *

 * @example jQuery(function($) {

 *   // Your code using failsafe $ alias here...

 * });

 * @desc Uses both the shortcut for $(document).ready() and the argument

 * to write failsafe jQuery code using the $ alias, without relying on the

 * global alias.

 *

 * @name $

 * @param Function fn The function to execute when the DOM is ready.

 * @cat Core

 * @type jQuery

 * @see ready(Function)

 */

jQuery.fn = jQuery.prototype = {
    /**
     * The current version of jQuery.
     *
     * @private
     * @property
     * @name jquery
     * @type String
     * @cat Core
     */
    jquery: "1.1.2",

    /**
     * The number of elements currently matched. The size function will return the same value.
     *
     * @example $("img").length;
     * @before <img src="test1.jpg"/> <img src="test2.jpg"/>
     * @result 2
     *
     * @property
     * @name length
     * @type Number
     * @cat Core
     */

    /**
     * Get the number of elements currently matched. This returns the same
     * number as the 'length' property of the jQuery object.
     *
     * @example $("img").size();
     * @before <img src="test1.jpg"/> <img src="test2.jpg"/>
     * @result 2
     *
     * @name size
     * @type Number
     * @cat Core
     */
    size: function() {
        return this.length;
    },
    
    length: 0,

    /**
     * Access all matched DOM elements. This serves as a backwards-compatible
     * way of accessing all matched elements (other than the jQuery object
     * itself, which is, in fact, an array of elements).
     *
     * It is useful if you need to operate on the DOM elements themselves instead of using built-in jQuery functions.
     *
     * @example $("img").get();
     * @before <img src="test1.jpg"/> <img src="test2.jpg"/>
     * @result [ <img src="test1.jpg"/> <img src="test2.jpg"/> ]
     * @desc Selects all images in the document and returns the DOM Elements as an Array
     *
     * @name get
     * @type Array<Element>
     * @cat Core
     */

    /**
     * Access a single matched DOM element at a specified index in the matched set.
     * This allows you to extract the actual DOM element and operate on it
     * directly without necessarily using jQuery functionality on it.
     *
     * @example $("img").get(0);
     * @before <img src="test1.jpg"/> <img src="test2.jpg"/>
     * @result <img src="test1.jpg"/>
     * @desc Selects all images in the document and returns the first one
     *
     * @name get
     * @type Element
     * @param Number num Access the element in the Nth position.
     * @cat Core
     */
    get: function( num ) {
        return num == undefined ?

            // Return a 'clean' array
            jQuery.makeArray( this ) :

            // Return just the object
            this[num];
    },
    
    /**
     * Set the jQuery object to an array of elements, while maintaining
     * the stack.
     *
     * @example $("img").pushStack([ document.body ]);
     * @result $("img").pushStack() == [ document.body ]
     *
     * @private
     * @name pushStack
     * @type jQuery
     * @param Elements elems An array of elements
     * @cat Core
     */
    pushStack: function( a ) {
        var ret = jQuery(a);
        ret.prevObject = this;
        return ret;
    },
    
    /**
     * Set the jQuery object to an array of elements. This operation is
     * completely destructive - be sure to use .pushStack() if you wish to maintain
     * the jQuery stack.
     *
     * @example $("img").setArray([ document.body ]);
     * @result $("img").setArray() == [ document.body ]
     *
     * @private
     * @name setArray
     * @type jQuery
     * @param Elements elems An array of elements
     * @cat Core
     */
    setArray: function( a ) {
        this.length = 0;
        [].push.apply( this, a );
        return this;
    },

    /**
     * Execute a function within the context of every matched element.
     * This means that every time the passed-in function is executed
     * (which is once for every element matched) the 'this' keyword
     * points to the specific DOM element.
     *
     * Additionally, the function, when executed, is passed a single
     * argument representing the position of the element in the matched
     * set (integer, zero-index).
     *
     * @example $("img").each(function(i){
     *   this.src = "test" + i + ".jpg";
     * });
     * @before <img/><img/>
     * @result <img src="test0.jpg"/><img src="test1.jpg"/>
     * @desc Iterates over two images and sets their src property
     *
     * @name each
     * @type jQuery
     * @param Function fn A function to execute
     * @cat Core
     */
    each: function( fn, args ) {
        return jQuery.each( this, fn, args );
    },

    /**
     * Searches every matched element for the object and returns
     * the index of the element, if found, starting with zero. 
     * Returns -1 if the object wasn't found.
     *
     * @example $("*").index( $('#foobar')[0] ) 
     * @before <div id="foobar"><b></b><span id="foo"></span></div>
     * @result 0
     * @desc Returns the index for the element with ID foobar
     *
     * @example $("*").index( $('#foo')[0] ) 
     * @before <div id="foobar"><b></b><span id="foo"></span></div>
     * @result 2
     * @desc Returns the index for the element with ID foo within another element
     *
     * @example $("*").index( $('#bar')[0] ) 
     * @before <div id="foobar"><b></b><span id="foo"></span></div>
     * @result -1
     * @desc Returns -1, as there is no element with ID bar
     *
     * @name index
     * @type Number
     * @param Element subject Object to search for
     * @cat Core
     */
    index: function( obj ) {
        var pos = -1;
        this.each(function(i){
            if ( this == obj ) pos = i;
        });
        return pos;
    },

    /**
     * Access a property on the first matched element.
     * This method makes it easy to retrieve a property value
     * from the first matched element.
     *
     * If the element does not have an attribute with such a

      * name, undefined is returned.
     *
     * @example $("img").attr("src");
     * @before <img src="test.jpg"/>
     * @result test.jpg
     * @desc Returns the src attribute from the first image in the document.
     *
     * @name attr
     * @type Object
     * @param String name The name of the property to access.
     * @cat DOM/Attributes
     */

    /**
     * Set a key/value object as properties to all matched elements.
     *
     * This serves as the best way to set a large number of properties
     * on all matched elements.
     *
     * @example $("img").attr({ src: "test.jpg", alt: "Test Image" });
     * @before <img/>
     * @result <img src="test.jpg" alt="Test Image"/>
     * @desc Sets src and alt attributes to all images.
     *
     * @name attr
     * @type jQuery
     * @param Map properties Key/value pairs to set as object properties.
     * @cat DOM/Attributes
     */

    /**
     * Set a single property to a value, on all matched elements.
     *
     * Note that you can't set the name property of input elements in IE.
     * Use $(html) or .append(html) or .html(html) to create elements
     * on the fly including the name property.
     *
     * @example $("img").attr("src","test.jpg");
     * @before <img/>
     * @result <img src="test.jpg"/>
     * @desc Sets src attribute to all images.
     *
     * @name attr
     * @type jQuery
     * @param String key The name of the property to set.
     * @param Object value The value to set the property to.
     * @cat DOM/Attributes
     */
     
    /**
     * Set a single property to a computed value, on all matched elements.
     *
     * Instead of supplying a string value as described
     * [[DOM/Attributes#attr.28_key.2C_value_.29|above]],
     * a function is provided that computes the value.
     *
     * @example $("img").attr("title", function() { return this.src });
     * @before <img src="test.jpg" />
     * @result <img src="test.jpg" title="test.jpg" />
     * @desc Sets title attribute from src attribute.
     *
     * @example $("img").attr("title", function(index) { return this.title + (i + 1); });
     * @before <img title="pic" /><img title="pic" /><img title="pic" />
     * @result <img title="pic1" /><img title="pic2" /><img title="pic3" />
     * @desc Enumerate title attribute.
     *
     * @name attr
     * @type jQuery
     * @param String key The name of the property to set.
     * @param Function value A function returning the value to set.
     *            Scope: Current element, argument: Index of current element
     * @cat DOM/Attributes
     */
    attr: function( key, value, type ) {
        var obj = key;
        
        // Look for the case where we're accessing a style value
        if ( key.constructor == String )
            if ( value == undefined )
                return this.length && jQuery[ type || "attr" ]( this[0], key ) || undefined;
            else {
                obj = {};
                obj[ key ] = value;
            }
        
        // Check to see if we're setting style values
        return this.each(function(index){
            // Set all the styles
            for ( var prop in obj )
                jQuery.attr(
                    type ? this.style : this,
                    prop, jQuery.prop(this, obj[prop], type, index, prop)
                );
        });
    },

    /**
     * Access a style property on the first matched element.
     * This method makes it easy to retrieve a style property value
     * from the first matched element.
     *
     * @example $("p").css("color");
     * @before <p style="color:red;">Test Paragraph.</p>
     * @result "red"
     * @desc Retrieves the color style of the first paragraph
     *
     * @example $("p").css("font-weight");
     * @before <p style="font-weight: bold;">Test Paragraph.</p>
     * @result "bold"
     * @desc Retrieves the font-weight style of the first paragraph.
     *
     * @name css
     * @type String
     * @param String name The name of the property to access.
     * @cat CSS
     */

    /**
     * Set a key/value object as style properties to all matched elements.
     *
     * This serves as the best way to set a large number of style properties
     * on all matched elements.
     *
     * @example $("p").css({ color: "red", background: "blue" });
     * @before <p>Test Paragraph.</p>
     * @result <p style="color:red; background:blue;">Test Paragraph.</p>
     * @desc Sets color and background styles to all p elements.
     *
     * @name css
     * @type jQuery
     * @param Map properties Key/value pairs to set as style properties.
     * @cat CSS
     */

    /**
     * Set a single style property to a value, on all matched elements.
     * If a number is provided, it is automatically converted into a pixel value.
     *
     * @example $("p").css("color","red");
     * @before <p>Test Paragraph.</p>
     * @result <p style="color:red;">Test Paragraph.</p>
     * @desc Changes the color of all paragraphs to red
     *
     * @example $("p").css("left",30);
     * @before <p>Test Paragraph.</p>
     * @result <p style="left:30px;">Test Paragraph.</p>
     * @desc Changes the left of all paragraphs to "30px"
     *
     * @name css
     * @type jQuery
     * @param String key The name of the property to set.
     * @param String|Number value The value to set the property to.
     * @cat CSS
     */
    css: function( key, value ) {
        return this.attr( key, value, "curCSS" );
    },

    /**
     * Get the text contents of all matched elements. The result is
     * a string that contains the combined text contents of all matched
     * elements. This method works on both HTML and XML documents.
     *
     * @example $("p").text();
     * @before <p><b>Test</b> Paragraph.</p><p>Paraparagraph</p>
     * @result Test Paragraph.Paraparagraph
     * @desc Gets the concatenated text of all paragraphs
     *
     * @name text
     * @type String
     * @cat DOM/Attributes
     */

    /**
     * Set the text contents of all matched elements.
     *
     * Similar to html(), but escapes HTML (replace "<" and ">" with their
     * HTML entities).
     *
     * @example $("p").text("<b>Some</b> new text.");
     * @before <p>Test Paragraph.</p>
     * @result <p>&lt;b&gt;Some&lt;/b&gt; new text.</p>
     * @desc Sets the text of all paragraphs.
     *
     * @example $("p").text("<b>Some</b> new text.", true);
     * @before <p>Test Paragraph.</p>
     * @result <p>Some new text.</p>
     * @desc Sets the text of all paragraphs.
     *
     * @name text
     * @type String
     * @param String val The text value to set the contents of the element to.
     * @cat DOM/Attributes
     */
    text: function(e) {
        if ( typeof e == "string" )
            return this.empty().append( document.createTextNode( e ) );

        var t = "";
        jQuery.each( e || this, function(){
            jQuery.each( this.childNodes, function(){
                if ( this.nodeType != 8 )
                    t += this.nodeType != 1 ?
                        this.nodeValue : jQuery.fn.text([ this ]);
            });
        });
        return t;
    },

    /**
     * Wrap all matched elements with a structure of other elements.
     * This wrapping process is most useful for injecting additional
     * stucture into a document, without ruining the original semantic
     * qualities of a document.
     *
     * This works by going through the first element
     * provided (which is generated, on the fly, from the provided HTML)
     * and finds the deepest ancestor element within its
     * structure - it is that element that will en-wrap everything else.
     *
     * This does not work with elements that contain text. Any necessary text
     * must be added after the wrapping is done.
     *
     * @example $("p").wrap("<div class='wrap'></div>");
     * @before <p>Test Paragraph.</p>
     * @result <div class='wrap'><p>Test Paragraph.</p></div>
     * 
     * @name wrap
     * @type jQuery
     * @param String html A string of HTML, that will be created on the fly and wrapped around the target.
     * @cat DOM/Manipulation
     */

    /**
     * Wrap all matched elements with a structure of other elements.
     * This wrapping process is most useful for injecting additional
     * stucture into a document, without ruining the original semantic
     * qualities of a document.
     *
     * This works by going through the first element
     * provided and finding the deepest ancestor element within its
     * structure - it is that element that will en-wrap everything else.
     *

      * This does not work with elements that contain text. Any necessary text
     * must be added after the wrapping is done.
     *
     * @example $("p").wrap( document.getElementById('content') );
     * @before <p>Test Paragraph.</p><div id="content"></div>
     * @result <div id="content"><p>Test Paragraph.</p></div>
     *
     * @name wrap
     * @type jQuery
     * @param Element elem A DOM element that will be wrapped around the target.
     * @cat DOM/Manipulation
     */
    wrap: function() {
        // The elements to wrap the target around
        var a = jQuery.clean(arguments);

        // Wrap each of the matched elements individually
        return this.each(function(){
            // Clone the structure that we're using to wrap
            var b = a[0].cloneNode(true);

            // Insert it before the element to be wrapped
            this.parentNode.insertBefore( b, this );

            // Find the deepest point in the wrap structure
            while ( b.firstChild )
                b = b.firstChild;

            // Move the matched element to within the wrap structure
            b.appendChild( this );
        });
    },

    /**
     * Append content to the inside of every matched element.
     *
     * This operation is similar to doing an appendChild to all the
     * specified elements, adding them into the document.
     *
     * @example $("p").append("<b>Hello</b>");
     * @before <p>I would like to say: </p>
     * @result <p>I would like to say: <b>Hello</b></p>
     * @desc Appends some HTML to all paragraphs.
     *
     * @example $("p").append( $("#foo")[0] );
     * @before <p>I would like to say: </p><b id="foo">Hello</b>
     * @result <p>I would like to say: <b id="foo">Hello</b></p>
     * @desc Appends an Element to all paragraphs.
     *
     * @example $("p").append( $("b") );
     * @before <p>I would like to say: </p><b>Hello</b>
     * @result <p>I would like to say: <b>Hello</b></p>
     * @desc Appends a jQuery object (similar to an Array of DOM Elements) to all paragraphs.
     *
     * @name append
     * @type jQuery
     * @param <Content> content Content to append to the target
     * @cat DOM/Manipulation
     * @see prepend(<Content>)
     * @see before(<Content>)
     * @see after(<Content>)
     */
    append: function() {
        return this.domManip(arguments, true, 1, function(a){
            this.appendChild( a );
        });
    },

    /**
     * Prepend content to the inside of every matched element.
     *
     * This operation is the best way to insert elements
     * inside, at the beginning, of all matched elements.
     *
     * @example $("p").prepend("<b>Hello</b>");
     * @before <p>I would like to say: </p>
     * @result <p><b>Hello</b>I would like to say: </p>
     * @desc Prepends some HTML to all paragraphs.
     *
     * @example $("p").prepend( $("#foo")[0] );
     * @before <p>I would like to say: </p><b id="foo">Hello</b>
     * @result <p><b id="foo">Hello</b>I would like to say: </p>
     * @desc Prepends an Element to all paragraphs.
     *    
     * @example $("p").prepend( $("b") );
     * @before <p>I would like to say: </p><b>Hello</b>
     * @result <p><b>Hello</b>I would like to say: </p>
     * @desc Prepends a jQuery object (similar to an Array of DOM Elements) to all paragraphs.
     *
     * @name prepend
     * @type jQuery
     * @param <Content> content Content to prepend to the target.
     * @cat DOM/Manipulation
     * @see append(<Content>)
     * @see before(<Content>)
     * @see after(<Content>)
     */
    prepend: function() {
        return this.domManip(arguments, true, -1, function(a){
            this.insertBefore( a, this.firstChild );
        });
    },
    
    /**
     * Insert content before each of the matched elements.
     *
     * @example $("p").before("<b>Hello</b>");
     * @before <p>I would like to say: </p>
     * @result <b>Hello</b><p>I would like to say: </p>
     * @desc Inserts some HTML before all paragraphs.
     *
     * @example $("p").before( $("#foo")[0] );
     * @before <p>I would like to say: </p><b id="foo">Hello</b>
     * @result <b id="foo">Hello</b><p>I would like to say: </p>
     * @desc Inserts an Element before all paragraphs.
     *
     * @example $("p").before( $("b") );
     * @before <p>I would like to say: </p><b>Hello</b>
     * @result <b>Hello</b><p>I would like to say: </p>
     * @desc Inserts a jQuery object (similar to an Array of DOM Elements) before all paragraphs.
     *
     * @name before
     * @type jQuery
     * @param <Content> content Content to insert before each target.
     * @cat DOM/Manipulation
     * @see append(<Content>)
     * @see prepend(<Content>)
     * @see after(<Content>)
     */
    before: function() {
        return this.domManip(arguments, false, 1, function(a){
            this.parentNode.insertBefore( a, this );
        });
    },

    /**
     * Insert content after each of the matched elements.
     *
     * @example $("p").after("<b>Hello</b>");
     * @before <p>I would like to say: </p>
     * @result <p>I would like to say: </p><b>Hello</b>
     * @desc Inserts some HTML after all paragraphs.
     *
     * @example $("p").after( $("#foo")[0] );
     * @before <b id="foo">Hello</b><p>I would like to say: </p>
     * @result <p>I would like to say: </p><b id="foo">Hello</b>
     * @desc Inserts an Element after all paragraphs.
     *
     * @example $("p").after( $("b") );
     * @before <b>Hello</b><p>I would like to say: </p>
     * @result <p>I would like to say: </p><b>Hello</b>
     * @desc Inserts a jQuery object (similar to an Array of DOM Elements) after all paragraphs.
     *
     * @name after
     * @type jQuery
     * @param <Content> content Content to insert after each target.
     * @cat DOM/Manipulation
     * @see append(<Content>)
     * @see prepend(<Content>)
     * @see before(<Content>)
     */
    after: function() {
        return this.domManip(arguments, false, -1, function(a){
            this.parentNode.insertBefore( a, this.nextSibling );
        });
    },

    /**
     * Revert the most recent 'destructive' operation, changing the set of matched elements
     * to its previous state (right before the destructive operation).
     *
     * If there was no destructive operation before, an empty set is returned.
     *
     * A 'destructive' operation is any operation that changes the set of
     * matched jQuery elements. These functions are: <code>add</code>,
     * <code>children</code>, <code>clone</code>, <code>filter</code>,
     * <code>find</code>, <code>not</code>, <code>next</code>,
     * <code>parent</code>, <code>parents</code>, <code>prev</code> and <code>siblings</code>.
     *
     * @example $("p").find("span").end();
     * @before <p><span>Hello</span>, how are you?</p>
     * @result [ <p>...</p> ]
     * @desc Selects all paragraphs, finds span elements inside these, and reverts the
     * selection back to the paragraphs.
     *
     * @name end
     * @type jQuery
     * @cat DOM/Traversing
     */
    end: function() {
        return this.prevObject || jQuery([]);
    },

    /**
     * Searches for all elements that match the specified expression.
     
     * This method is a good way to find additional descendant
     * elements with which to process.
     *
     * All searching is done using a jQuery expression. The expression can be
     * written using CSS 1-3 Selector syntax, or basic XPath.
     *
     * @example $("p").find("span");
     * @before <p><span>Hello</span>, how are you?</p>
     * @result [ <span>Hello</span> ]
     * @desc Starts with all paragraphs and searches for descendant span
     * elements, same as $("p span")
     *
     * @name find
     * @type jQuery
     * @param String expr An expression to search with.
     * @cat DOM/Traversing
     */
    find: function(t) {
        return this.pushStack( jQuery.map( this, function(a){
            return jQuery.find(t,a);
        }), t );
    },

    /**
     * Clone matched DOM Elements and select the clones. 
     *
     * This is useful for moving copies of the elements to another
     * location in the DOM.
     *
     * @example $("b").clone().prependTo("p");
     * @before <b>Hello</b><p>, how are you?</p>
     * @result <b>Hello</b><p><b>Hello</b>, how are you?</p>
     * @desc Clones all b elements (and selects the clones) and prepends them to all paragraphs.
     *
     * @name clone
     * @type jQuery
     * @param Boolean deep (Optional) Set to false if you don't want to clone all descendant nodes, in addition to the element itself.
     * @cat DOM/Manipulation
     */
    clone: function(deep) {
        return this.pushStack( jQuery.map( this, function(a){
            var a = a.cloneNode( deep != undefined ? deep : true );
            a.$events = null; // drop $events expando to avoid firing incorrect events
            return a;
        }) );
    },

    /**
     * Removes all elements from the set of matched elements that do not
     * match the specified expression(s). This method is used to narrow down
     * the results of a search.
     *
     * Provide a comma-separated list of expressions to apply multiple filters at once.
     *
     * @example $("p").filter(".selected")
     * @before <p class="selected">Hello</p><p>How are you?</p>
     * @result [ <p class="selected">Hello</p> ]
     * @desc Selects all paragraphs and removes those without a class "selected".
     *
     * @example $("p").filter(".selected, :first")
     * @before <p>Hello</p><p>Hello Again</p><p class="selected">And Again</p>
     * @result [ <p>Hello</p>, <p class="selected">And Again</p> ]
     * @desc Selects all paragraphs and removes those without class "selected" and being the first one.
     *
     * @name filter
     * @type jQuery
     * @param String expression Expression(s) to search with.
     * @cat DOM/Traversing
     */
     
    /**
     * Removes all elements from the set of matched elements that do not
     * pass the specified filter. This method is used to narrow down
     * the results of a search.
     *
     * @example $("p").filter(function(index) {
     *   return $("ol", this).length == 0;
     * })
     * @before <p><ol><li>Hello</li></ol></p><p>How are you?</p>
     * @result [ <p>How are you?</p> ]
     * @desc Remove all elements that have a child ol element
     *
     * @name filter
     * @type jQuery
     * @param Function filter A function to use for filtering
     * @cat DOM/Traversing
     */
    filter: function(t) {
        return this.pushStack(
            jQuery.isFunction( t ) &&
            jQuery.grep(this, function(el, index){
                return t.apply(el, [index])
            }) ||

            jQuery.multiFilter(t,this) );
    },

    /**
     * Removes the specified Element from the set of matched elements. This
     * method is used to remove a single Element from a jQuery object.
     *
     * @example $("p").not( $("#selected")[0] )
     * @before <p>Hello</p><p id="selected">Hello Again</p>
     * @result [ <p>Hello</p> ]
     * @desc Removes the element with the ID "selected" from the set of all paragraphs.
     *
     * @name not
     * @type jQuery
     * @param Element el An element to remove from the set
     * @cat DOM/Traversing
     */

    /**
     * Removes elements matching the specified expression from the set
     * of matched elements. This method is used to remove one or more
     * elements from a jQuery object.
     *
     * @example $("p").not("#selected")
     * @before <p>Hello</p><p id="selected">Hello Again</p>
     * @result [ <p>Hello</p> ]
     * @desc Removes the element with the ID "selected" from the set of all paragraphs.
     *
     * @name not
     * @type jQuery
     * @param String expr An expression with which to remove matching elements
     * @cat DOM/Traversing
     */

    /**
     * Removes any elements inside the array of elements from the set
     * of matched elements. This method is used to remove one or more
     * elements from a jQuery object.
     *
     * Please note: the expression cannot use a reference to the
     * element name. See the two examples below.
     *
     * @example $("p").not( $("div p.selected") )
     * @before <div><p>Hello</p><p class="selected">Hello Again</p></div>
     * @result [ <p>Hello</p> ]
     * @desc Removes all elements that match "div p.selected" from the total set of all paragraphs.
     *
     * @name not
     * @type jQuery
     * @param jQuery elems A set of elements to remove from the jQuery set of matched elements.
     * @cat DOM/Traversing
     */
    not: function(t) {
        return this.pushStack(
            t.constructor == String &&
            jQuery.multiFilter(t, this, true) ||

            jQuery.grep(this, function(a) {
                return ( t.constructor == Array || t.jquery )
                    ? jQuery.inArray( a, t ) < 0
                    : a != t;
            })
        );
    },

    /**
     * Adds more elements, matched by the given expression,
     * to the set of matched elements.
     *
     * @example $("p").add("span")
     * @before (HTML) <p>Hello</p><span>Hello Again</span>
     * @result (jQuery object matching 2 elements) [ <p>Hello</p>, <span>Hello Again</span> ]
     * @desc Compare the above result to the result of <code>$('p')</code>,
     * which would just result in <code><nowiki>[ <p>Hello</p> ]</nowiki></code>.
     * Using add(), matched elements of <code>$('span')</code> are simply
     * added to the returned jQuery-object.
     *
     * @name add
     * @type jQuery
     * @param String expr An expression whose matched elements are added
     * @cat DOM/Traversing
     */
     
    /**
     * Adds more elements, created on the fly, to the set of
     * matched elements.
     *
     * @example $("p").add("<span>Again</span>")
     * @before <p>Hello</p>
     * @result [ <p>Hello</p>, <span>Again</span> ]
     *
     * @name add
     * @type jQuery
     * @param String html A string of HTML to create on the fly.
     * @cat DOM/Traversing
     */

    /**
     * Adds one or more Elements to the set of matched elements.
     *
     * @example $("p").add( document.getElementById("a") )
     * @before <p>Hello</p><p><span id="a">Hello Again</span></p>
     * @result [ <p>Hello</p>, <span id="a">Hello Again</span> ]
     *
     * @example $("p").add( document.forms[0].elements )
     * @before <p>Hello</p><p><form><input/><button/></form>
     * @result [ <p>Hello</p>, <input/>, <button/> ]
     *
     * @name add
     * @type jQuery
     * @param Element|Array<Element> elements One or more Elements to add
     * @cat DOM/Traversing
     */
    add: function(t) {
        return this.pushStack( jQuery.merge(
            this.get(),
            t.constructor == String ?
                jQuery(t).get() :
                t.length != undefined && (!t.nodeName || t.nodeName == "FORM") ?
                    t : [t] )
        );
    },

    /**
     * Checks the current selection against an expression and returns true,
     * if at least one element of the selection fits the given expression.
     *
     * Does return false, if no element fits or the expression is not valid.
     *
     * filter(String) is used internally, therefore all rules that apply there
     * apply here, too.
     *
     * @example $("input[@type='checkbox']").parent().is("form")
     * @before <form><input type="checkbox" /></form>
     * @result true
     * @desc Returns true, because the parent of the input is a form element
     * 
     * @example $("input[@type='checkbox']").parent().is("form")
     * @before <form><p><input type="checkbox" /></p></form>
     * @result false
     * @desc Returns false, because the parent of the input is a p element
     *
     * @name is
     * @type Boolean
     * @param String expr The expression with which to filter
     * @cat DOM/Traversing
     */
    is: function(expr) {
        return expr ? jQuery.filter(expr,this).r.length > 0 : false;
    },
    
    /**
     * Get the content of the value attribute of the first matched element.
     *
     * Use caution when relying on this function to check the value of
     * multiple-select elements and checkboxes in a form. While it will
     * still work as intended, it may not accurately represent the value
     * the server will receive because these elements may send an array
     * of values. For more robust handling of field values, see the
     * [http://www. fieldValue function of the Form Plugin].
     *
     * @example $("input").val();
     * @before <input type="text" value="some text"/>
     * @result "some text"
     *
     * @name val
     * @type String
     * @cat DOM/Attributes
     */
    
    /**
     *     Set the value attribute of every matched element.
     *
     * @example $("input").val("test");
     * @before <input type="text" value="some text"/>
     * @result <input type="text" value="test"/>
     *
     * @name val
     * @type jQuery
     * @param String val Set the property to the specified value.
     * @cat DOM/Attributes
     */
    val: function( val ) {
        return val == undefined ?
            ( this.length ? this[0].value : null ) :
            this.attr( "value", val );
    },
    
    /**
     * Get the html contents of the first matched element.
     * This property is not available on XML documents.
     *
     * @example $("div").html();
     * @before <div><input/></div>
     * @result <input/>
     *
     * @name html
     * @type String
     * @cat DOM/Attributes
     */
    
    /**
     * Set the html contents of every matched element.
     * This property is not available on XML documents.
     *
     * @example $("div").html("<b>new stuff</b>");
     * @before <div><input/></div>
     * @result <div><b>new stuff</b></div>
     *
     * @name html
     * @type jQuery
     * @param String val Set the html contents to the specified value.
     * @cat DOM/Attributes
     */
    html: function( val ) {
        return val == undefined ?
            ( this.length ? this[0].innerHTML : null ) :
            this.empty().append( val );
    },
    
    /**
     * @private
     * @name domManip
     * @param Array args
     * @param Boolean table Insert TBODY in TABLEs if one is not found.
     * @param Number dir If dir<0, process args in reverse order.
     * @param Function fn The function doing the DOM manipulation.
     * @type jQuery
     * @cat Core
     */
    domManip: function(args, table, dir, fn){
        var clone = this.length > 1; 
        var a = jQuery.clean(args);
        if ( dir < 0 )
            a.reverse();

        return this.each(function(){
            var obj = this;

            if ( table && jQuery.nodeName(this, "table") && jQuery.nodeName(a[0], "tr") )
                obj = this.getElementsByTagName("tbody")[0] || this.appendChild(document.createElement("tbody"));

            jQuery.each( a, function(){
                fn.apply( obj, [ clone ? this.cloneNode(true) : this ] );
            });

        });
    }
};

/**

 * Extends the jQuery object itself. Can be used to add functions into

 * the jQuery namespace and to [[Plugins/Authoring|add plugin methods]] (plugins).

 * 

 * @example jQuery.fn.extend({

 *   check: function() {

 *     return this.each(function() { this.checked = true; });

 *   },

 *   uncheck: function() {

 *     return this.each(function() { this.checked = false; });

 *   }

 * });

 * $("input[@type=checkbox]").check();

 * $("input[@type=radio]").uncheck();

 * @desc Adds two plugin methods.

 *

 * @example jQuery.extend({

 *   min: function(a, b) { return a < b ? a : b; },

 *   max: function(a, b) { return a > b ? a : b; }

 * });

 * @desc Adds two functions into the jQuery namespace

 *

 * @name $.extend

 * @param Object prop The object that will be merged into the jQuery object

 * @type Object

 * @cat Core

 */

/**

 * Extend one object with one or more others, returning the original,

 * modified, object. This is a great utility for simple inheritance.

 * 

 * @example var settings = { validate: false, limit: 5, name: "foo" };

 * var options = { validate: true, name: "bar" };

 * jQuery.extend(settings, options);

 * @result settings == { validate: true, limit: 5, name: "bar" }

 * @desc Merge settings and options, modifying settings

 *

 * @example var defaults = { validate: false, limit: 5, name: "foo" };

 * var options = { validate: true, name: "bar" };

 * var settings = jQuery.extend({}, defaults, options);

 * @result settings == { validate: true, limit: 5, name: "bar" }

 * @desc Merge defaults and options, without modifying the defaults

 *

 * @name $.extend

 * @param Object target The object to extend

 * @param Object prop1 The object that will be merged into the first.

 * @param Object propN (optional) More objects to merge into the first

 * @type Object

 * @cat JavaScript

 */
jQuery.extend = jQuery.fn.extend = function() {
    // copy reference to target object
    var target = arguments[0],
        a = 1;

    // extend jQuery itself if only one argument is passed
    if ( arguments.length == 1 ) {
        target = this;
        a = 0;
    }
    var prop;
    while (prop = arguments[a++])
        // Extend the base object
        for ( var i in prop ) target[i] = prop[i];

    // Return the modified object
    return target;
};

jQuery.extend({
    /**
     * Run this function to give control of the $ variable back
     * to whichever library first implemented it. This helps to make 
     * sure that jQuery doesn't conflict with the $ object
     * of other libraries.
     *
     * By using this function, you will only be able to access jQuery
     * using the 'jQuery' variable. For example, where you used to do
     * $("div p"), you now must do jQuery("div p").
     *
     * @example jQuery.noConflict();
     * // Do something with jQuery
     * jQuery("div p").hide();
     * // Do something with another library's $()
     * $("content").style.display = 'none';
     * @desc Maps the original object that was referenced by $ back to $
     *
     * @example jQuery.noConflict();
     * (function($) { 
     *   $(function() {
     *     // more code using $ as alias to jQuery
     *   });
     * })(jQuery);
     * // other code using $ as an alias to the other library
     * @desc Reverts the $ alias and then creates and executes a
     * function to provide the $ as a jQuery alias inside the functions
     * scope. Inside the function the original $ object is not available.
     * This works well for most plugins that don't rely on any other library.
     * 
     *
     * @name $.noConflict
     * @type undefined
     * @cat Core 
     */
    noConflict: function() {
        if ( jQuery._$ )
            $ = jQuery._$;
        return jQuery;
    },

    // This may seem like some crazy code, but trust me when I say that this
    // is the only cross-browser way to do this. --John
    isFunction: function( fn ) {
        return !!fn && typeof fn != "string" && !fn.nodeName && 
            typeof fn[0] == "undefined" && /function/i.test( fn + "" );
    },
    
    // check if an element is in a XML document
    isXMLDoc: function(elem) {
        return elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;
    },

    nodeName: function( elem, name ) {
        return elem.nodeName && elem.nodeName.toUpperCase() == name.toUpperCase();
    },

Behind the glory of a lonely words
荣耀的背后刻着一道孤独......
2008-08-21 17:05
wanution
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谢谢楼上回答,不过请解释下撒。
2008-08-22 14:08
fanfan912
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昨天也曾看过这个文件,看不懂,来凑个热闹
2008-08-22 14:14
快速回复:谁能解这段javascript代码?
数据加载中...
 
   



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