apply 高级应用

function Rectangle()
{
	this.width = 0;
	this.height = 0;
	this.area = function(){ return this.width * this.height;};
}

var o = new Object();
Rectangle.apply(o);
o.width = 10;
o.height = 20;
alert(o.area());

var Class = {
	create : function(){
		return function(){
			this.initialize.apply(this,arguments);
		}
	}
}

//创建类
var Rectangle = Class.create();
Rectangle.prototype = {
	initialize : function(width,height){
		this.width = width;
		this.height = height;
	},
	toString : function(){
		return "width:" + this.width + "\r\n" + "height:" + this.height;
	}
}

//实例化对象并初始化
var rectangle = new Rectangle(80,120);
alert(rectangle.toString());