构造器调用模式

当一个函数对象被创建时，Function构造器会运行类似这样的代码：

this.prototype = {constructor: this}

new一个函数事会发生：

Function.method('new', function() {    // 创建新对象，继承原型    let that = Object.create(this.prototype);    // 调用构造函数，绑定this到新对象    let res = this.apply(that, arguments);    return typeof res === 'object' && res || that;});

伪类继承

let Mammal = function(name) {    this.name = name;}Mammal.prototype.get_name = function() {    return this.name;}// 构造一个实例let myMammal = new Mammal('zhangsan');// 利用伪类继承Mammallet Cat = function(name) {    this.name = name;    this.age = age;}Cat.prototype = new Mammal();Cat.prototype.get_age = function() {    return this.age;}let myCat = new Cat('miao');

以上就是一个简单的伪类继承。使用构造器有个严重的危害，如果在调用构造器函数的时候忘记使用new前缀，this不仅不会绑定到新对象，还会污染全局变量；

原型模式

原型模式中，我们采用对象来继承。

let myMammal = {    name: 'aa',    age: 22,    get_name: function() {        return this.name;    }}let myCat = Object.create(myMammal);Cat.get_age = function() {    return this.age;}

这种继承方式，导致没有私有属性和私有函数

函数化模式

它的每一层都是在扩充that

Function.prototype.method = function (name,func) {    this.prototype[name] = func;    return this; }// 工厂mammal函数var mammal = function (spec) {    var that = {};    that.get_name = function () {        return spec.name;    }    that.says = function (spec) {        return spec.saying || '';    }     return that;}// 工厂cat函数(基于mammal的函数)var cat = function (spec) {    spec.saying = spec.saying || 'meow';    // 直接调用mammal函数    var that = mammal(spec);    that.purr = function (n) {        var i, s = '';        for (i = 0; i < n; i += 1) {            if(s) {                s += '-';            }            s += 'r';        }    }    that.get_name = function () {        return that.says() + ' ' + spec.name + ' ' + that.says();    }    return that;}// 创建myCat对象var myCat = cat({name: 'Henrietta'});Object.method('superior',function (name) {    var that = this,        method = that[name];    return function () {        return method.apply(that, arguments)    }})// 工厂coolcat函数(基于cat函数)var coolcat = function (spec) {    var that = cat(spec),        super_get_name = that.superior('get_name');    that.get_name = function (n) {        return 'like ' + super_get_name() + ' baby';    }    return that;}var myCoolCat = coolcat({name : 'Bix'});var name = myCoolCat.get_name();

部件

没看懂。。

let eventuality = function(that) {    let registry = {};    that.fire = function(event) {        let array,             func,            handler,            i,            type = typeof event === 'string' ? event : event.type;        if (registry.hasOwnProperty(type)) {            array = registry[type];            for(i = 0; i < array.length; i++) {                handler = array[i];                func = handler.method;                if (typeof func === 'string') {                    func = this[func];                }                func.apply(this, handler.parameters || [events]);            }        }        return this;                }    that.on = function(type, method, parameters) {        let handler= {            method,            parameters        };        if (registry.hasOwnProperty(type)) {            registry[type].push(handler);        } else {            registry[type] = [handler];        }        return this;    }    return that;}