<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count()
{
var num1=parseInt(document.getElementById("txt1").value);
var num2=parseInt(document.getElementById("txt2").value);
var opp=document.getElementById("select"）.value;
var sum='';
switch (opp)
{
case '+':
sum=num1+num2 ;
break;
case "-"
sum=num1-num2 ;
break;
case "*"
sum=num1*num2 ;
break;
case "/"
sum=num1/num2 ;
break;
}
document.getElementById("fruit"）.value = sum;
}
</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>
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