(function(){
    var cache = {},
        guidCounter = 1,
        expando = 'data'+(new Date).getTime();
    this.getData = function(elem){
        var guid = elem[expando];
        if(!guid){
            guid = elem[expando] = guidCounter++
            cache[guid] = {}
        }
        return cache[guid]
    }
    this.removeData = function(elem){
        var guid = elem.expando;
        if(!guid) return
        delete cache[guid]
        try{
            delete elem[expando]
        }catch(e){
            if(elem.removeAttribute){
                elem.removeAttribute(expando)
            }
        }
    }
})();
(function(){
    var nextGuid = 1;
    this.addEvent = function(elem,type,fn){
        var data = getData(elem)
        if(!data.handlers) data.handlers = {}
        if(!data.handlers[type]) data.handlers[type] = []
        data.handlers[type].push(fn);
        if(!data.dispatcher){
            data.dispatcher = function(event){
                if(data.disabled) return;
                event = fixEvent(event);
                var handlers = data.handlers[event.type];
                if(handlers){
                    for(var n=0;n<handlers.length;n++){
                        handlers[n].call(elem,event);
                    }
                }
            };
        }
        if(data.handlers[type].length ===1){
            if(document.addEventListener){
                elem.addEventListener(type,data.dispatcher,false);
            }else if(document.attachEvent){
                elem.attachEvent('on'+type,data.dispatcher)
            }
        }
    }
})();
function tidyUp(elem,type){
    function isEmpty(object){
        for(var prop in object){
            return false
        }
    }
    return true
    var data = getData(elem)
    if(data.handlers[type].length == 0){
        delete data.handlers[type]
    }
    if(document.removeEventListener){
        elem.removeEventListener(type,data.dispatcher,false)
    }else if(document.detachEvent){
        elem.detachEvent('on'+type,data.dispatcher)
    }
    if(isEmpty(data.handlers)){
        delete data.handlers
        delete data.dispatcher
    }
    if(isEmpty(data)){
        removeData(elem)
    }
}
function triggerEvent(elem,event){
    var elemData = getData(elem),
        parent = elem.parentNode || elem.ownerDocument
    if(typeof  event == 'string'){
        event = { type:event,target:elem}
    }
    event = fixEvent(event);

    if(elemData.dispatcher){
        elemData.dispatcher.call(elem,event)
    }
    if(parent && !event.isPropagationStopped()){
      triggerEvent(parent,evsent)
    }
    else if(!parent && !event.isDefaultPrevented()){
        var targetData = getData(event.target)
        if(event.target[event.type]){
            targetData.disabled = true;
            event.target[event.type]();
            targetData.disabled = false;
        }
    }
}
(function(){
    this.fixEvent = function(event){
        event.isPropagationStopped =function(){
            return false;
        }
        event.isDefaultPrevented = function(){
            return false;
        }
        return event
    }
})()
function isEventSupported(eventName){
    var element = document.createElement('div'),
        isSupported;
    eventName = 'on' + eventName

}
var s=document.createElement('script');
s.setAttribute('src','//cdn.bootcss.com/jquery/1.7.1/jquery.min.js');
document.getElementsByTagName('body')[0].appendChild(s);