显示不出来，不知道哪儿错了
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>switch</title>
<script type="text/javascript">
var myweek=4;
switch(myweek)
{
case 1:
case 2:
document.write("学习理论知识");
break;
case 3:
case 4:
document.write("到企业实践");
break;
case 5:
document.write("总结经验");
break;
default:
document.write("周六、日休息和娱乐");
}
</script>
</head>
<body>
</body>
</html>
