<html>
<head>
<title>javascript In the typeof The use of </title>
<script>
//1. Basic types
var x = 123;
var y = "abc";
var z = true;
//alert(typeof x);//number
//alert(typeof y);//string
//alert(typeof z);//boolean
//2. Reference type. The type is object
var arr = new Array();
var date = new Date();
var str = new String("abc");
//alert(typeof arr);//object
//alert(typeof date);//object
//alert(typeof str);//object
//3. Object type, which can be understood as the simulation of classes in javascript is realized through function
alert(typeof Array);//function
alert(typeof Date);//function
alert(typeof String);//function
</script>
</head>
<body>
</body>
</html>