<!DOCTYPE html>
<html>
<head>
<title> 事件</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;
switch(c)
{
case "+":
document.getElementById("fruit").value=parselnt(a)+parselnt(b);
break;
case "-":
document.getElementById("fruit").value=parselnt(a)-parselnt(b);
break;
case "*":
document.getElementById("fruit").value=parselnt(a)*parselnt(b);
break;
case "/":
document.getElementById("fruit").value=parselnt(a)/parselnt(b);
break;
}
}
</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>
Caballarii
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