function Emitter() {    this._listener = [];//_listener[自定义的事件名] = [所用执行的匿名函数1, 所用执行的匿名函数2]}//注册事件Emitter.prototype.bind = function(eventName, callback) {    var listener = this._listener[eventName] || [];//this._listener[eventName]没有值则将listener定义为[](数组)。    listener.push(callback);    this._listener[eventName] = listener;} //触发事件Emitter.prototype.trigger = function(eventName) {    var args = Array.prototype.slice.apply(arguments).slice(1);//atgs为获得除了eventName后面的参数(注册事件的参数)    var listener = this._listener[eventName];    if(!Array.isArray(listener)) return;//自定义事件名不存在    listener.forEach(function(callback) {        try {            callback.apply(this, args);        }catch(e) {            console.error(e);        }    })}//实例var emitter = new Emitter();    emitter.bind("myevent", function(arg1, arg2) {        console.log(arg1, arg2);    });    emitter.bind("myevent", function(arg1, arg2) {        console.log(arg2, arg1);    });    emitter.trigger('myevent', "a", "b");

　　实现链式调用的例子，原理与事件模型相同

function LazyMan(name) {            return new _LazyMan(name);        }        function _LazyMan(name) {            console.log("Hi This is " + name)            this.task = [];            var _this = this;            var namer = (function(name) {                return function() {                    console.log(name);                    _this.next();                }            })(name)            this.task.push(namer);            setTimeout(function() {                _this.next();            }, 0);            return this;        }        _LazyMan.prototype.next = function() {            var fn = this.task.shift();            fn&&fn();        }        _LazyMan.prototype.eat = function(val) {            var _this = this;            var eat = (function(val) {                return function() {                    console.log("eat" + val);                    _this.next();                }            })(val);            this.task.push(eat);            return this;        }        _LazyMan.prototype.sleep = function(time) {            var _this = this;            var timer = (function(time) {                return function() {                    setTimeout(function() {                        console.log("wait");                          console.log("time=" + time);                        _this.next();                    }, time*1000);                }                            })(time);            this.task.push(timer);            return this;        }        //LazyMan("Hank").eat("dinner").eat("supper");    LazyMan("Hank").sleep(3).eat("dinner");