JavaScript object-oriented programming_javascript skills

//Definition of class

//Method 1: General definition method of class
function player1(_name)
{
this.name = _name;
this.say = function () {alert(this.name);};
}

var p1 = new player1('llinzzi1');
p1.say();


//Method 2: prototype definition method
var player2 = function() {}
player2.prototype = {
name:'',
say:function(){
alert( this.name);
}
}

var p2 = new player2();
p2.name = 'llinzzi2';
p2.say();

                                                                                                   );
}
player3.prototype = {
init:function(_name){
this.name = _name;
say:function(){
alert(this.name);
}
}

var p3 = new player3('llinzzi3');
p3.say();

//Class Inheritance of

//Method 1
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();


//Method 2 The above method cannot use the {} method, modify the method
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();




//From prototype.js Copy the browser judgment code

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);