Javascript语法和基本方法

1.typeof 和instanceof的联系

• typeof：基本数据类型

var a="Mark";  
var b=true;  
var c=10;  
var d;  
var e=null;  
var f=new Object();  
var g = new Date()
  
console.log(typeof a); //string  
console.log(typeof b); //number  
console.log(typeof c); //boolean  
console.log(typeof d); //undefined  
console.log(typeof e); //object  
console.log(typeof f); //object  
console.log(typeof g); //object  

• instanceof：引用类型

var array=new Array();  
var object=new Object();  
var date=new Date();  
function func(){};  
var func1=new func();  
  
console.log(array instanceof Array);  //true  
console.log(object instanceof Object);  //true  
console.log(date instanceof Date);  //true  
console.log(func1 instanceof func);  //true