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js data type

高洛峰
Release: 2016-10-08 16:24:10
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1142 people have browsed it

js数据类型有以下几种
字符串、数字、布尔、数组、对象、Null、Undefined
字符串  
  var carname="Bill Gates";
数字    
  var x=34;
布尔    
  var x=true或者var y=false
数组
  var cars=new Array();
  cars[0]="Audi";
  cars[1]="BMW";
  cars[2]="Volvo";
  var cars=new Array("Audi","BMW","Volvo");
  var cars=["Audi","BMW","Volvo"];
对象
  var person={firstname:"Bill", lastname:"Gates", id:5566};
Null、Undefined
  Undefined表示变量被声明了,但没有赋值,当声明的变量还未被初始化时,变量的默认值为undefined
  null用来表示尚未存在的对象,常用来表示函数企图返回一个不存在的对象
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