<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
var weather = 'sunny';
switch(weather){
case 'sunny':
alter(1);
break
case 'rainy':
alter(2);
// 编写switch语句 小心不要遗漏break,否则遇到break才结束
break case穿透
case 'snowing':
alter(3);
break
default:
alter(4);
break;
}
</script>
</body>
</html>