創(chuàng)建對(duì)象

var car= new Object();
var car ={};

屬性和方法對(duì)

• 設(shè)置屬性{A:x,B:y} 用逗號(hào)分隔
  var car={
  color:"red",//屬性
  run:function(){alter("run")}//方法
  }
  car.color; //"red"
  car.run(); //alter("run"),run是一個(gè)函數(shù),加（）直接執(zhí)行函數(shù)
  car.["color"]; //"red",字符串調(diào)用屬性
  car."run";
• 增加屬性和方法
  var car={
  color:"red",
  run:function(){alter("run")}
  }
  car.type="suv";
  car.stop=function(){alter("stop")};
• 修改屬性和方法
  car.color="white";
• 刪除屬性和方法
  delete.car.color;
  car.color;//undefined

對(duì)象的構(gòu)建方法

• obj.constructor;
  var car={
  color:"red",
  run:function(){alter("run")}
  }
  car.constructor;//Object

  var num= new Number(123);
  num.constructor;//Number
  

把對(duì)象轉(zhuǎn)為字符串

• obj.toString()
  var num= New Number(123);
  num.toString();//"123"

獲取對(duì)象的原始值

• obj.valueOf()
  var num= New Number(123);
  num.valueOf();//123

是否含有某個(gè)參數(shù)

• obj.hasOwnProperty(“”)
  var car={
  color:"red",
  run:function(){alter("run")}
  }
  car.hasOwnProperty("color") //true
  car.hasOwnProperty("stop") //false