SOURCE

 function DataBinder(object_id){
        var pubSub={
            callbacks:{},
            on: function (msg,callback){
                this.callbacks[msg]=this.callbacks[msg]||[];
                this.callbacks[msg].push(callback);
            },
            publish:function(msg){
                console.log(msg,arguments)
                 this.callbacks[msg]=this.callbacks[msg]||[];
                 for(var i=0,len=this.callbacks[msg].length;i<len;i++){
                     this.callbacks[msg][i].apply(this,arguments);
                 }
            }
        },
        data_attr="data-bind-"+object_id,
        message=object_id+":change",yuan
        changeHandler=function(evt){
            var target=evt.target||evt.srcElemnt;
                prop_name=target.getAttribute(data_attr);
                if (prop_name&&prop_name!==""){
                    pubSub.publish(message,prop_name,target.value);
                }
        };
        if (document.addEventListener){
            document.addEventListener('change',changeHandler,false);
        }else{
            document.attachEvent("onchange",changeHandler);
        }

      pubSub.on(message,function(vet,prop_name,new_val){
          var elements=document.querySelectorAll("["+data_attr+"="+prop_name+"]"),
          tag_name;
          for (var i=0,len=elements.length;i<len;i++){
              tag_name=elements[i].tagName.toLowerCase();

              if(tag_name==="input"||tag_name==="textarea"||tag_name==="select"){
                  elements[i].value=new_val;
              }else{
                  element[i].innerHTML=new_val;
              }
          }

      });
      return pubSub;
      }


function User(uid){
    var binder=new DataBinder(uid),
    user={
       attributes:{},
       set:function(attr_name,val){
           this.attributes[attr_name]=val;
           binder.publish(uid+":change",attr_name,val);
       },
       get:function(attr_name){
           return this.attributes[attr_name];
       },
      

    };
   
    return user;
}

var user=new User(123);
user.set("name","wolfgang")

<input type="text" data-bind-123="name"/>