<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>switch</title>
<script type="text/JavaScript">
var myweek =3;//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
case 7
document.write("周六、日休息和娱乐");
break;
default;
document.write(data error);
}
</script>
</head>
<body>
</body>
</html> 
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Blank, nothing is displayed, please give me an answer - PHP Chinese website Q&A - Blank, nothing is displayed, please give me an answer - PHP Chinese website Q&A
Take a look around and learn.
document.write(data error);
这句要加双引号
document.write("data error");