Javascript is a loosely typed language, which means that variables do not
need to have a type specified. Objects in Javascript map property names to arbitrary property values.

map means 映射  arbitrary means 随意的 任意的

the little-known language Self. 很少知道的一种语言：Self.

Like Perl, Javascript is an interpreted language, and it draws inspiration from Perl in a number of areas, such as its regular-expression and array-handling features.

interpreted language 解释型语言
draw inspiration from 从...中获取灵感
regular-expression 正则表达式
array-handling 数组操作

Javascript is most commonly used in web browsers, and, in that context, the general-purpose core is extended with objects that allow scripts to interact with the user, control the web browser, and alter the document content that appears within the web browsers window.

javascript 在 web 浏览器中应用最为广泛， 在此环境中，通用目的的核心通过对象得到扩展，这些对象允许
脚步与用户交互，控制web 浏览器，以及修改出现在浏览器窗口中的文档内容。

this embedded version of javascript runs scripts embedded within HTML web pages.
这种嵌入式版本的Javascript运行嵌入到HTML web 页面中的脚步。

This is commonly called client-side javascript to emphasize that scripts are run by
the client computer rather than the web server.
他通常称作客户端的javascript，以强调脚本是由客户端计算机运行的而不是由web服务器运行的。

[ 本帖最后由 有容就大 于 2013-7-19 00:12 编辑 ]

哇 大公鸡又叫了。

The core Javascript language and its built-in datatypes are the subject of international standards,
and compatibility across implementations is very good.
Javascript 的核心语言及其内建的数据类型都符合国际标准，他们跨平台的兼容性都灰常的好。

Part of client-side javascript are formally standardized, other parts are de facto standards, and
other parts are browser-specific extensions.
客户端的javascript一部分是正式化标准的，其他一部分是事实上的标准，而另一部分是特定于浏览器的扩展。

Cross-browser compatibility is often an important concern for client-side javascript programmers.
跨浏览器的兼容性常常是客户端的javascript程序员所关心的一个重要问题。

embark （on） 乘船 装载 从事..

[ 本帖最后由 有容就大 于 2013-7-19 00:26 编辑 ]

我现在看的是 Javascript权威指南第五版 (英文版)。

手边还有个 Javascript权威指南第六版中文版的 呵呵

不是说看完这个东西 别的都是浮云了么

慢慢看 反正有中文版的 也不怕看不明白。

Javascript is the subject of a fair bit of misinformation and confusion.
Before proceeding any further, it is important to debunk two common and persistent myths about the language.

a fair bit of 相当 不少
javascript是一个相当容易被误解和混淆的主题。
在对它进行进一步之前，有必要澄清两点长期存在的对该语言的误解。

One of the most common misconceptions about javascript is that it is a simplified version
of java, the programming language from Sun Microsystems.
对javascript最常见的误解就是认为他是Sun Microsystems公司的程序设计语言Java的简化版本。

Other  than an incomplete syntactic resemblance and the fact that both Java and Javascript
can provide executable content in web browsers, the two languages are entirely unrelated.
但是除了语法上有些相似之处以及都能够提供Web浏览器中的可执行内容之外，这两种语言是完全不相干的。

The similarity of names is purely a marketing ploy by Netscape and Sun(The language was originally
called LiveScript, its name was changed to Javascript at the last minute). However, Javacript can, in
fact, script Jave.
名称上的相似完全是Netscape和Sun的一种营销策略罢了（它最初叫LiveScript,最后才改成Javascript）。然而，实际上，Javascript可以脚本化Java.


[ 本帖最后由 有容就大 于 2013-7-21 00:28 编辑 ]

Good Morning EveryOne...

Thank you, I will carry on.

Javascript is not simple

Because Javascript is interpreted instead of compiled, it is often considered a scripting langauge instead
of a true programming language.
由于Javascript是解释型的而不是编译型的语言，它往往被认为是一种脚本语言，而不被看作是一种真正的编程语言。

The implication is that scripting langauge are simpler and that they are programming languages for
nonprogrammers.
这种看法的潜台词是：脚本语言比较简单，它是非程序员所使用的编程语言。

The fact that Javascript is loosely typed does make it somewhat more forgiving for
unsophisticated programmers. And many web designers have been able to use javascript for limited,
cookbook-style programming tasks.
实际上，javascript的松散类型确实对缺乏经验的程序员很宽容。很多web设计者已经能够使用javascript来完成有限的，菜单式的任务。

 

Beneath its thin veneer of simplicity, however, Javascript is a full-featured rogramming language, as complex as any and more complex than some.
但是在简单的外表之下，javascript却是一种具有复杂功能的程序设计语言，它和其他所有语言一样复杂，甚至比某些语言还好复杂的多。

Programmer who attempt to use javascript for nontrivial tasks often found the process frustrating if they do not hava a solid understanding of the language.
如果一个程序员对javascript没有扎实的理解，那么当他要用javascript执行较复杂的任务时，就会发现这个过程困难重重。

This book documents javascript comprehensively so that you can develop a sophisticated understanding.
本书对javascript进行了详细的介绍，以便读者能深入的理解它。