<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script>
var num = 10;
console.log(typeof num);//number
var str = 'pink';
console.log(typeof str);//string
var flag = true;
console.log(typeof flag)//boolean
var vari = undefined;
console.log(typeof bari);//undefined
var timer = null;
console.log(typeof timer);//object
//prompt 取过来的值是字符型
var age = prompt('请输入你的年龄');
console.log(age);
console.log(typeof age);
</script>
</head>
<body>
</body>
</html>
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