代码示例：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script>
var num=100
alert(num)
console.log(num)
document.write(num)
</script>
</body>
</html>
标签：console,变量,示例,Js,num,document From： https://www.cnblogs.com/xu529/p/16991105.html