【学习】js学习笔记：对象的遍历和封装特性

1、对象的属性访问：

对象.属性

对象[属性]，但中括号中必须是字符串

2、属性的遍历：

for in方法举例：

var ren={};

ren.name="名字";

ren.eat=function(){

alert("吃饭");

}

for(var i in ren){

alert(ren[i]);

}

3、封装-工厂函数，这种方式格式不规范

function dianshi(color,size,brand){

var tv={};

tv.color=color;

tv.size=size;

tv.brand=brand;

tv.play=function(){

alert("玩");

}

tv.look=function(){

alert("看");

}

return tv;

}

var d1=dianshi("red","42cun","sony");

var d2=dianshi("blue","40cun","长虹");

var d3=dianshi("green","30cun","康佳");

alert(d1.color);

alert(d2.size);

alert(d3.brand);

4、封装-构造函数，这种方式格式更正式

function tv(color,size,brand){

this.color=color;

this.size=size;

this.brand=brand;

this.play=function(){

alert("玩");

}

this.look=function(){

alert("看");

}

}

var d1=new tv("red","42cun","sony");

var d2=new tv("blue","40cun","长虹");

var d3=new tv("green","30cun","康佳");

alert(d1.color);

alert(d2.size);

alert(d3.brand);

5、封装-代码段

prototype方法：将共有的方法和属性添加到代码段中

function tv(color,size,brand){

this.color=color;

this.size=size;

this.brand=brand;

this.look=function(){

alert("看");

}

}

tv.prototype.play=function(){

alert("玩");

}

var d1=new tv();

d1.play();

6、混合方法：几种方式的混合，扬长避短

function tv(color,size,brand){

this.color=color;

this.size=size;

this.brand=brand;

this.look=function(){

alert("看");

}

}

tv.prototype.obj={name:"名字"}

tv.prototype.play=function(){

alert("玩");

}

var d1=new tv();

d1.play();

alert(d1.obj.name);