<!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=gb2312" />
<title> 计算器</title>
<script type="text/javascript">
function ys(){
var y=document.getElementById("yi").value;
var e=document.getElementById("er").value;
var ee=document.getElementById("dd").value;
var s="";
switch(ee)
{
case "加":
s=parseInt(y)+parseInt(e);
break;
case"减":
s=parseInt(y)-parseInt(e);
break;
case"乘":
s=parseInt(y)*parseInt(e);
break;
default:
s=parseInt(y)/parseInt(e);
}
document.getElementById("san"）.value=s;
}
</script>
</head>
<body>
<input id="yi" type="text" />
<select id="dd">
<option value="加">+</option>
<option value="减">-</option>
<option value="乘">*</option>
<option value="除">/</option>
</select>
<input id="er" type="text" />
<input value="=" type="button" onclick="ys()" />
<input id="san" type="text" />
</body>
</html>
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