速求javascript实现windows标准计算器的代码
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<style type="text/css">
.button
{
width:42px;
font-weight:normal;
}
.button1
{
width:86px;
font-weight:normal
}
.button2
{
width:42px;
height:55px;
font-weight:normal;
}
div{
position:absolute;
}
a{
text-decoration:none;
}
</style>
<script language="JavaScript">
<!--
var other="";
var rember=0;
var j=0;
var y=0;
var rember2=0;
var bool=false;
function input(){
var key=event.keyCode;
if (key>=48&&key<=57)
{
show(String.fromCharCode(key));
}
if (key==43||key==45||key==42||key==47)
{
ysf(String.fromCharCode(key));
}
if (key==13)
{
doc.focus();//将光标移到文本框
js();
}
if (key==46)
{
dh();
}
}
//----------控制键盘输入------------
function show(n){
if(doc.value=="0" || bool==true){
doc.value=n;
bool=false;
}
else
{
doc.value+=n;
}
}
//-------------显示框--------；
function CE(){
doc.value="0";//清除当前数
}
function C(){
j=0;
y=0;
rember2=0;
other="";
bool=false;
doc.value="0";
rember=0; //全部清除
}
function back(){
if (bool==false)
{
if (doc.value.length==1)
{
doc.value="0";
}
else if (doc.value.length==2)
{
if (doc.value.substring(0,1)=="-")
{
doc.value="0";
}
else
{
doc.value=doc.value.substring(0,doc.value.length-1);// 带负号的退格
}
}
else
{
doc.value=doc.value.substring(0,doc.value.length-1);// 常规退格
}
}
}
function ysf(s){
y++; //记录函数内部运算符的输入次数
if (y>1 && bool==false)
{
if(other=="+")
{
doc.value=rember+parseFloat(doc.value);
}
if(other=="-")
{
doc.value=rember-parseFloat(doc.value);
}
if(other=="/")
{
if (parseFloat(doc.value) != 0)
{
doc.value=rember/parseFloat(doc.value);
}
else
{
doc.value="除数不能为0";
}
}
if(other=="*")
{
doc.value=rember*parseFloat(doc.value);
}
}
rember=parseFloat(doc.value);
other=s;
bool=true;
}
//////////////
function teshu (m){
if (m=="%")
{
doc.value=rember*parseFloat(doc.value)/100;
}
if (m=="sqrt")
{
if (parseFloat(doc.value)>=0)
{
doc.value=Math.sqrt(parseFloat(doc.value));
}
else
{
doc.value="负数不能开方";
bool=true;
}
}
if (m=="1/x")
{
if (rember==0)
{
doc.value="0没有倒数";
bool=true;
}
else
{
doc.value=1/parseFloat(doc.value);
}
}
if (m=="+/-")
{
doc.value=parseFloat(doc.value)*(-1);
}
}
//////////////
function js(){
j++; //纪录等号的输入次数
if (j<=1)
{
rember2=parseFloat(doc.value);
}
if (j>1)
{
rember=rember2; //用于连等运算
}
if (other=="+")
{
doc.value=rember+parseFloat(doc.value);
}
if (other=="-")
{
if (j<=1)
{
doc.value=rember-parseFloat(doc.value);
}
else
{
doc.value=parseFloat(doc.value)-rember;
}
}
if (other=="*")
{
doc.value=rember*parseFloat(doc.value);
}
if (other=="/")
{
if (j<=1)
{
if (parseFloat(doc.value)!=0)
{
doc.value=rember*Math.pow(10,2)/(parseFloat(doc.value)*Math.pow(10,2));
}
else
{
doc.value="除数不能为0";
bool=true;
}
}
else
{
doc.value=doc.value*Math.pow(10,2)/(rember*Math.pow(10,2));
}
}
if (other=="x^y")
{
doc.value=Math.pow(rember,parseFloat(doc.value));
}
y=0;
bool=true;
}
//----------------等号--------------------
var save;
function ms(){
if (doc.value!=0)
{
jilu.value="M";
save=doc.value;
bool=true;
}
else
{
jilu.value="";
}
}
function mc(){
jilu.value="";
save="";
}
function mr(){
if (jilu.value=="")
{
doc.value="0";
}
else
{
doc.value=save;
}
}
function mj(){
if (doc.value!="0" && jilu.value=="")
{
jilu.value="M";
save=doc.value;
}
else
{
save=parseFloat(save)+parseFloat(doc.value);
}
}
//-----------------数字的存取---------------
function dh(){
j=0;
if (doc.value.indexOf(".")>-1 || bool==true)
{
doc.value="0.";
bool=false;
}
else if(doc.value.indexOf(".") < 0)
{
doc.value+=".";
}
}
//-------------------点号控制----------------
function meun(){
for (var i=1;i<4 ;i++ )
{
eval("div"+i).style.display="none";
}
}
function xiala(n) {
var obj = document.getElementById("div"+n);
if (obj.style.display=="none")
{
meun();
obj.style.display="inline";
}
else
{
obj.style.display="none";
}
}
//--------------菜单-------------------
function showtime(){
var arr=["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];
var now=new Date();
var mons=now.getMonth()+1;
var today=now.getDate();
var hours=now.getHours();
var mins=now.getMinutes();
var secs=now.getSeconds();
var days=now.getDay();
var week=arr[days];
if (mins<10)
{
mins="0"+mins;
}
if (secs<10)
{
secs="0"+secs;
}
time.value=week+" "+hours+":"+mins+":"+secs;
}
setInterval("showtime()",1000);
//------------------时间---------------------
//-->
</SCRIPT>
</HEAD>
<BODY onKeypress="input()">
<table border="1" align="center" cellspacing="0" cellpadding="0">
<tr bgcolor="#E4E0CD">
<td colspan="2">
<a onClick="xiala(1)" href="#">编辑（E）</a><br>
<div id="div1" style="display:none"><a href="#">复制</a><br><a href="#">粘贴</a></div></td>
<td colspan="2">
<a onClick="xiala(2)" href="#">查看（V）</a><br>
<div id="div2" style="display:none"><a href="#">标准型</a><br><a href="#">科学型</a></div></td>
<td colspan="2">
<a onClick="xiala(3)" href="#">帮助（H）</a><br>
<div id="div3" style="display:none"><a href="#">帮助主题</a><br><a href="#">关于计算器</a></div></td>
</tr>
<tr>
<td colspan="6"><input type="text" name="doc" readonly="readonly" size="39" style="text-align:right" value="0"></td>
</tr>
<tr>
<td colspan="3"><input type="text" name="time" size="17" readonly=readonly></td>
<td colspan="2"><input type="button" value="backspace" class="button1" onClick="back()"></td>
<td><input name="button10" type="button" class="button" value="CE" onClick="CE()"></td>
</tr>
<tr>
<td><input type="text" name="jilu" class="button" readonly="readonly" style="text-align:center"></td>
<td><input type="button" value="1" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="2" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="3" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="+" class="button" onClick="ysf(this.value)"></td>
<td><input type="button" value="C" class="button" onClick="C()"> </td>
</tr>
<tr>
<td><input type="button" class="button" value="MC" onClick="mc()"></td>
<td><input type="button" value="4" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="5" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="6" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="*" class="button" onClick="ysf(this.value)"></td>
<td><input name="button3" type="button" class="button" onClick="teshu(this.value)" value="+/-"></td>
</tr>
<tr>
<td><input type="button" class="button" value="MR" onClick="mr()"></td>
<td><input type="button" value="7" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="8" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="9" class="button" onClick="show(this.value)"></td>
<td><input type="button" value="/" class="button" onClick="ysf(this.value)"></td>
<td><input type="button" value="sqrt" class="button" onClick="teshu(this.value)"></td>
</tr>
<tr>
<td><input type="button" class="button" value="MS" onClick="ms()"></td>
<td><input type="button" class="button" onClick="show(this.value)" value="0"></td>
<td><input type="button" class="button" value="." onClick="dh()"></td>
<td><input type="button" class="button" value="%" onClick="teshu(this.value)"></td>
<td><input type="button" class="button" value="-" onClick="ysf(this.value)"></td>
<td rowspan="2"><input type="button" class="button2" value="close" onClick="window.close()"></td>
</tr>
<tr>
<td><input type="button" class="button" value="M+" onClick="mj()"></td>
<td><input type="button" class="button" value="x^y" onClick="ysf(this.value)"></td>
<td><input type="button" class="button" value="1/x" onClick="teshu(this.value)"></td>
<td colspan="2"><input type="button" class="button1" onClick="js()" value="="></td>
</tr>
</table>
</BODY>
</HTML>
