谁能帮我改一下代码，为什么结果不对，在线等
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>switch</title>
<script type="text/JavaScript">
function b(){
var myweek =document.getElementById("a").value;//myweek表示星期几变量
switch(myweek)
{
case 1:
case 2:
document.write("学习理念知识");
break;
case 3:
case 4:
document.write("到企业实践");
break;
case 5:
document.write("总结经验");
break;
case 6:
document.write("周六、日休息和娱乐");
default:
document.write("请重新输入") ;
}
}
</script>
</head>
<body>
<div>请输入工作日：</div>
<input type="text" id="a">
<input type="button" name="button" value="查看工作安排" onclick="b()">
</body>
</html>
