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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
</body>
</html>
 
.box div { height: 200px; }
.main { 
  float: left;
  background: pink;
  width: 100%;
}
.left { 
  float: left;
  margin-left: -100%;
  width: 100px;
  background: lightblue;
}
.right { 
  width: 100px;
  float: left;
  background: #999;
  margin-left: -100px;
}
.con {
  padding: 0 100px;
}
 
var publisher = {}; //发布者
publisher.cache = {}; //订阅者缓存列表
publisher.listen = function(key, fn){ // 订阅
  if(!this.cache[key]){
    this.cache[key] = []
  }
  this.cache[key].push(fn)
}
publisher.trigger = function(){ //发布
  var key = Array.prototype.shift.call(arguments); //取出消息类型
  var _this = this,
      args = arguments;
  setTimeout(function(){
    var fns = _this.cache[key];
    if(!fns || fns.length==0)
      return false;
    for(var i=0;i<fns.length;i++){
      fns[i].apply(_this, args)
    }
  }, 0);
  return this;
}
publisher.remove = function(key, fn){ //退订
  var fns = this.cache[key]
  if(!fns)
    return false
  if(!fn){
    fns && (fns.length = 0)
  }else{
    for(var i=fns.length-1;i>=0;i--){
      if(fns[i] === fn){
        fns.splice(i, 1)
      }
    }
  }
}
publisher.trigger('fruit', '###').trigger('fruit', 'apple')
publisher.listen('fruit', function(s){
    console.log('fruit: ' + s)
})
publisher.listen('fruit', fn1 = function(s){
    console.log('fruit#: ' + s)
})
//publisher.trigger('fruit', 'banana')
//publisher.remove('fruit', fn1)
//publisher.trigger('fruit', 'apple')
Output 300px

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