你这十有八九是是忘记监听mouseup事件并clearInterval定时器了

放代码

var addEvent=(function(){
    if(document.addEventListener){
        return function(el,type,fn){
            if(el.length){
                for(var i=0;i<el.length;i++){
                    addEvent(el[i],type,fn);
                }
            }else{
                el.addEventListener(type,fn,false);
            }
        };
    }else{
        return function(el,type,fn){
            if(el.length){
                for(var i=0;i<el.length;i++){
                    addEvent(el[i],type,fn);
                }
            }else{
                el.attachEvent('on'+type,function(){
                    return fn.call(el,window.event);
                });
            }
        };
    }
})();

判断处理下就行了

记下了这个

if（e.stopPropagation）{

    e.stopPropogation();

} else{

    e.cancelBubble=true;

}

这还不简单?倒是可以写一个jquery插件