<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script type="text/javascript">
function count(){
var a=document.getElementById("txt1").value;
var b=document.getElementById("txt2").value;
var c=document.getElementById("select").value;
var d="";
switch(c){
case "+":d=parseFloat(a)+parseFloat(b); break;
case "-":d=parseFloat(a)-parseFloat(b); break;
case "*":d=parseFloat(a)*parseFloat(b); break;
default:d=parseFloat(a)/parseFloat(b) ;}
document.getElementById("fruit").value=d;}
</script>
</head>
<body>
<input type="text" id="txt1"/>
<select id='select'>
<option value='+'>+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" id="txt2"/>
<input type='button' value=' = ' onClick=count()/>
<input type='text' id='fruit' />
</body>
</html>
蜂之谷
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