<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var a1 = document.getElementById("txt1").value;
var a2 = document.getElementById("txt2").value;
var select = document.getElementById("select").value;
var re;
var num1 = parseInt(a1);
var num2 = parseInt(a2);
switch(select){
case'+';
re=num1+num2;
break;
case'-';
re=num1-num2;
break;
case'*';
re=num1*num2;
break;
case'/';
re=num1/num2;
break;
document.getElemntById("fruit").value=re;
}
}
</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()" /> <!--通过 = 按钮来调用创建的函数，得到结果-->
<input type='text' id='fruit' />
</body>
</html>
求帮忙
qq_诺L一世相伴_0
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