安装: npm install eventemitter3
使用:

     triggerEvent: function () {
        new EventEmitter().on('someEvent', function (params) {
          alert(params)
        });
        new EventEmitter().once('event-name', emitted, context);
        new EventEmitter().on('another-event', emitted, context);
        new EventEmitter().removeListener('another-event', emitted, context);
      },
      emitted: function() {
        new EventEmitter().emit('someEvent', '触发事件');
      }

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