帮我看看哪错了
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8"/>
<title></title>
<script>
var name='abc'
var sex='女'
switch(sex)
{
case '男':
alert(name+'先生,你好');
break;
case '女':
alert(name+'女士,你好');
break;
default:
alert(name+'你好');
}
</script>
</head>
</html>