JavaScript面向对象编程

//类的定义
    //方法一：类的一般定义方法
    function player1(_name)
    {
        this.name = _name;
        this.say = function() {alert(this.name);};
    }
    var p1 = new player1('llinzzi1');
    p1.say();
    
    //方法二：prototype定义方法
    var player2 = function() {}
    player2.prototype = {
        name:'',
        say:function(){
            alert(this.name);
        }
    }
    var p2 = new player2();
    p2.name = 'llinzzi2';
    p2.say();
    
    //方法三：上面的方法结构美观，便捷，但构建函数不能带参数，修改方法
    var player3 = function() {
        this.init.apply(this, arguments);
    }
    player3.prototype = {
        init:function(_name){
            this.name = _name;
        },
        say:function(){
            alert(this.name);
        }
    }
    var p3 = new player3('llinzzi3');
    p3.say();
    //类的继承
    //方法一
    var player4 = function(){
        this.init.apply(this, arguments);
    }
    player4.prototype = new player3;
    player4.prototype.shout = function(){
        alert(this.name.toUpperCase());
    }
    var p4 = new player4('llinzzi4');
    p4.shout();
    
    //方法二 上面的方法不能采用{}的方法，修改方法
    Object.extend = function(destination, source) {
      for (var property in source)
        destination[property] = source[property];
      return destination;
    };
    var player5 = function(){
        this.init.apply(this, arguments);
    }
    Object.extend(Object.extend(player5.prototype,player3.prototype),{
        shout:function(){
            alert(this.name.toUpperCase());
        }
    });
    var p5 = new player5('llinzzi5');
    p5.shout();
    
    
    //再从prototype.js抄一端浏览器判断代码
    Browser = {
        IE:     !!(window.attachEvent && !window.opera),
        Opera:  !!window.opera,
        WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
        Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
        MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
    }
    alert(Browser.MobileSafari);

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 from :http://dujuntian.blog.163.com/blog/static/28377554200864113648583/