Create Class：

var Class = function(parent){    var klass = function(){        this.init.apply(this, arguments);    };    if(parent) {        var subclass = function(){};        subclass.prototype = parent.prototype;        klass.prototype = new subclass;    }    klass.prototype.init = function(){};    klass.fn = klass.prototype;    klass.fn.parent = klass;    klass.proxy = function(func){        var self = this;        return (function(){            func.apply(self, arguments);        });    };    klass.fn.proxy = klass.proxy;    klass.extend = function(obj){        var extended = obj.extended;        for(var i in obj){            klass[i] = obj[i];        }        if (extended) extended(klass)    };    klass.include = function(obj){        var included = obj.included;        for(var i in obj){            klass.fn[i] = obj[i];        }        if (included) included(klass)    };    return klass;};

Demo:

var Person = new Class;Person.include({    init: function(name, age){        this.name = name;        this.age = Person.checkAge(age) ? age : null;    },    sayHello: function(){        console.log("Hi , My name is " + this.name + (this.age ? ", i am " + this.age + " years old this year" : ""));    }});Person.extend({    needWater: true,    checkAge: function(age){        return age>0 && age < 150;    }});var jim = new Person("Jim", 10);jim.sayHello();//output:Hi , My name is Jim, i am 10 years old this yearvar tom = new Person("Tom", -1);tom.sayHello();//output:Hi , My name is Tom

extend中是静态属性和方法，include中是实例属性和方法。

　　当属性和方法与具体实例无关或是公用的时候，用静态属性和方法，否则用实例属性和方法。

 

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