JavaScript 對(duì)象是擁有屬性和方法的數(shù)據(jù)。 就是key:value 也叫name:value

對(duì)象定義

1，var car = {
        type:"Fiat", 
        model:500, 
        color:"white"
};
//定義 JavaScript 對(duì)象可以跨越多行，空格跟換行不是必須的：
2,  var car = {};
      car.type = 'Fiat';
      car.model = '500';
      car.color = 'white'
//JavaScript 對(duì)象是變量的容器。

獲取對(duì)象value

var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"};

1，person.lastName; //John  常用這種
2，person["lastName"];  //John  用在number上 是不是跟數(shù)組一樣的 所有數(shù)據(jù)也是對(duì)象特殊的一種
      例如：var a = {1:'22',2:'2323'};   
      a.1 //報(bào)錯(cuò) 
      a[1] //22 在key 值為number的時(shí)候用

對(duì)象value 可以為function(){}

在對(duì)象中name:function(){};
var a = {
      a:'這就我',
      method:function(){ 
          console.log( 'ddd' )
     }
}
 a: text //這就我
a.method() //打印出ddd  類(lèi)似匿名函數(shù)

遍歷對(duì)象 也叫枚舉對(duì)象( 面試官會(huì)問(wèn)的 )

for in

var car = {type:"Fiat",  model:500,  color:"white"};
for ( var i in car ){ 
   console.log( i+':'+car[i] )
}
//type:Fiat,  model:500,  color:white
http://www.w3cplus.com/javascript/how-do-i-enumerate-the-properties-of-a-javascript-object.html