myweek为什么获取不到prompt提示框中的数
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>switch</title>
<script type="text/JavaScript">
function DoSome(){
var myweek=prompt("今天是周几?");
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:
case 7:
document.write("周六、日休息和娱乐");
default:
document.write("输入错误，不在1~7之间");
}
}
</script>
</head>
<body>
<input type="button" value="时间表" onClick="DoSome()">
</body>
</html>
