201505092150_《Javascript模式-观察者模式》

1.  定义

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

 

             }

 

           }

 

2.使用

 

    

var adultTv = Event();

 

adultTv .listen(  ''play',  function( data ){

 

   alert ( "今天是谁的电影" + data.name );

 

});

 

//发布者

 

adultTv .trigger(  ''play',  { 'name': '麻生希' }  )；