js网页计算器代码，效果非常炫，基本计算器功能。
效果图：
代码：
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS网页计算器代码 - www.jb200.com</title>
<style>
body,div,p,ul,li,input{margin:0;padding:0;}
ul{list-style-type:none;}
a{color:#fff;outline:none;text-decoration:none;}
body{font:700 24px/1.5 Arial;}
#calc{position:relative;width:300px;background:#000;margin:10px auto;}
#calc p{color:#fff;text-align:right;font:12px/20px Arial;padding:0 5px;background:#fff}
#calc .f-text{border:0;width:290px;height:84px;text-align:right;font:700 50px/84px Arial;background:url(img/inputBg.jpg) repeat-x;padding:0 5px;}
#calc ul{position:relative;overflow:hidden;zoom:1;background:url(img/bg.jpg);padding:0 0 17px 8px;}
#calc ul li{float:left;width:63px;height:41px;margin:17px 10px 0 0;}
#calc ul li a{display:block;width:63px;height:41px;line-height:41px;text-align:center;background:url(img/btn.png) no-repeat;}
#calc ul li a:hover{background-position:-63px 0;}
#calc ul li.btn-1 a{background-position:0 -41px;}
#calc ul li.btn-1 a:hover{background-position:-63px -41px;}
#calc ul li.btn-2{position:absolute;top:174px;right:0;height:99px;}
#calc ul li.btn-2 a{height:99px;line-height:99px;background-position:0 -164px;}
#calc ul li.btn-2 a:hover{background-position:-63px -164px;}
#calc ul li.btn-3{width:136px;}
#calc ul li.btn-3 a{width:136px;background-position:0 -82px;}
#calc ul li.btn-3 a:hover{background-position:0 -123px;}
#formula{position:absolute;top:20px;background:none;border:0;font:700 12px/1.5 Arial;width:280px;padding:3px 15px 0 5px;text-align:right;}
</style>
<script>
window.onload = function ()
{
var oCalc = document.getElementById("calc");
var aA = oCalc.getElementsByTagName("a");
var aInput = oCalc.getElementsByTagName("input")[0];
var oFormula = document.getElementById("formula");
var s = false;
var i = 0;
for (i = 0; i < aA.length; i++){
aA[i].onfocus = function ()
{
this.blur()
};
aA[i].onclick = function ()
{
switch(this.innerHTML)
{
case "c":
aInput.value = 0;
oFormula.value = "";
break;
case "%":
count("%")
break;
case "÷":
count("/")
break;
case "×":
count("*")
break;
case "-":
count("-")
break;
case "+":
count("+")
break;
case "=":
s || (oFormula.value += aInput.value);
aInput.value = eval(oFormula.value.replace(/%/*-+/,''));
aInput.value = aInput.value.substr(0,10).replace("NaN",0);
s = true;
break;
case ".":
if(aInput.value.search(/[.%/*-+]/) != -1)
break;
default:
s && (aInput.value = 0, oFormula.value = "", s = false);
aInput.value.length < 10 && (aInput.value = (aInput.value + this.innerHTML).replace(/^[0%/*-+](d)/,"$1"));
}
}
}
function count(a)
{
if(s)
{
oFormula.value = aInput.value + a;
aInput.value = a;
s = false;
}
else
{
/[%/*-+]$/.test(aInput.value) || (oFormula.value += aInput.value);
aInput.value = a;
/[%/*-+]$/.test(oFormula.value) || (oFormula.value += aInput.value);
oFormula.value = oFormula.value.slice(-1) != a ? oFormula.value.replace(/.$/,a) : oFormula.value
}
}
}
</script>
</head>
<body>
<div id="calc">
<p>js计算器代码 - www.jb200.com</p>
<input class="f-text" type="text" readonly="readonly" maxlength="9" value="0" />
<ul>
<li class="btn-1"><a href="javascript:void(0)">c</a></li>
<li class="btn-1"><a href="javascript:void(0)">%</a></li>
<li class="btn-1"><a href="javascript:void(0)">÷</a></li>
<li class="btn-1"><a href="javascript:void(0)">×</a></li>
<li><a href="javascript:void(0)">7</a></li>
<li><a href="javascript:void(0)">8</a></li>
<li><a href="javascript:void(0)">9</a></li>
<li class="btn-1"><a href="javascript:void(0)">-</a></li>
<li><a href="javascript:void(0)">4</a></li>
<li><a href="javascript:void(0)">5</a></li>
<li><a href="javascript:void(0)">6</a></li>
<li class="btn-1"><a href="javascript:void(0)">+</a></li>
<li><a href="javascript:void(0)">1</a></li>
<li><a href="javascript:void(0)">2</a></li>
<li><a href="javascript:void(0)">3</a></li>
<li class="btn-2"><a href="javascript:void(0)">=</a></li>
<li class="btn-3"><a href="javascript:void(0)">0</a></li>
<li><a href="javascript:void(0)">.</a></li>
</ul>
<input id="formula" type="text" readonly="readonly" value="" />
</div>
</body>
</html>
附，源码下载。