javascript 观察者模式

Events = function() {            var listen, log, obj, one, remove, trigger, __this;            obj = {};            __this = this;            listen = function( key, eventfn ) {  //把简历扔盒子, key就是联系方式.              var stack, _ref;  //stack是盒子              stack = ( _ref = obj[key] ) != null ? _ref : obj[ key ] = [];              return stack.push( eventfn );            };            one = function( key, eventfn ) {              remove( key );              return listen( key, eventfn );            };            remove = function( key ) {              var _ref;              return ( _ref = obj[key] ) != null ? _ref.length = 0 : void 0;            };            trigger = function() {  //面试官打电话通知面试者              var fn, stack, _i, _len, _ref, key;              key = Array.prototype.shift.call( arguments );              stack = ( _ref = obj[ key ] ) != null ? _ref : obj[ key ] = [];              for ( _i = 0, _len = stack.length; _i < _len; _i++ ) {                fn = stack[ _i ];                if ( fn.apply( __this,  arguments ) === false) {                  return false;                }              }              return {                 listen: listen,                 one: one,                 remove: remove,                 trigger: trigger              }            }