JS基础——数据类型判断typeof、instanceof、Object.prototype.toString

栏目: JavaScript · 发布时间: 6年前

内容简介：对应测试结果如下：

typeof
instanceof
Object.prototype.toString

对应测试结果如下：

	`typeof test`	`instanceof`	`Object.prototype.toString.call(test)`
var test = 'xuriliang';	string	test instanceof String `//false`	[object String]
var test = 27;	number	test instanceof Number `//false`	[object Number]
var test = true;	boolean	test instanceof Boolean `//false`	[object Boolean]
var test = [1,2,3];	object	test instanceof Array `//true`	[object Array]
		test instanceof Object `//true`
var test = null;	object	test instanceof Object `//false`	[object Null]
var test = undefined;	undefined	test instanceof Object `//false`	[object Undefined]
var test = new String('xuriliang')	object	test instanceof String `//true`	[object String]
		test instanceof Object `//true`
var test = new Number(27)	object	test instanceof Number `//true`	[object Number]
		test instanceof Object `//true`
var test = new Boolean(true)	object	test instanceof Boolean `//true`	[object Boolean]
		test instanceof Object `//true`
var test = new Array(1,2,3)	object	test instanceof Array `//true`	[object Array]
		test instanceof Object `//true`
var test = function(){}	function	test instanceof Function `//true`	[object Function]
		test instanceof Object `//true`
var test = /d/	object	test instanceof RegExp `//true`	[object RegExp]
		test instanceof Object `//true`