求问这个为什么不行？谢谢啦QAQ
<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var t1=document.getElementById("txt1"）.value;
var t2=document.getElementById("txt2"）.value;
var s=document.getElementById("select").value;
var out="";
switch (s)
{
case "+":
out=parseInt(t1)+parseInt(t2);
break;
case "-":
out=parseInt(t1)-parseInt(t2);
break;
case "*":
out=parseInt(t1)*parseInt(t2);
break;
default:
out=parseInt(t1)/parseInt(t2);
}
document.getElementById("fruit"）.value=out;
}
</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>
