201505092150_《Javascript模式-观察者模式》

浏览数：23 / 时间：2015年06月08日

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‘ }  )；