javaScript中的几个基本类型

 1 //typeof函数输出的一共有几种类型
 2 console.log(typeof(a));    //undefined
 3 console.log(typeof(10));    //number
 4 console.log(typeof("zhang"));    //string
 5 console.log(typeof(true));    //boolean
 6 
 7 console.log(typeof(function fn(){}));    //function
 8 console.log(typeof({name:"sere",age:11}));  //object
 9 console.log(typeof(new Number(11)));    //object
10 var bb = null;
11 console.log(typeof(bb));  //object