急急急，不显示答案，半天了
<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var v1 = document.getElementById ("txt1").value;
var v2 = document.getElementById ("txt2").value;
var v3 = document.getElementById ("select").value;
var result = "";
switch(v3){
case "+":
result = parseInt(v1)+parseInt(v2)；
break;
case "-":
result = parseInt(v1)-parseInt(v2)；
break;
case "*":
result = parseInt(v1)*parseInt(v2)；
break;
default:
result = parseInt(v1)/parseInt(v2)；
}
document.getElementById("fruit").value = result;
}
</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>
