JavaScript缓存机制优化网页浏览体验

dom.eventTypes = dom.array(String("abort blur change click contextmenu  \
              dblclick error focus  keydown keypress keyup load mousedown  \
              mouseenter mouseup mouseleave mousemove mouseover mouseout \
              reset resize  select submit unload").match(/\w+/g));
 //******************************缓存系统***********************
 dom.mixin({
     uuid : 0,
     storage: {},
     buildCache:function(item){
         var key,cache = dom.storage;
         //如果是window
         if ( item.setInterval && ( item !== window && !item.frameElement )) {
             key =  "dom-window"
         }else if(item.nodeType){
             if(!item.uuid){
                 item.uuid = "dom" + dom.uuid++
                 dom.cache("uuid","uuid-set",item);//保存元素的引用
             }//如果当前元素没有uuid这属性，那么为它添加一个      
             key =  item.uuid
         }else if(dom.isString(item)){
             key =  item;
         }else{
            throw "item must be element node ,window or string"
         }
         if(!cache[key]){
             cache[key] = {};
         }
         return cache[key]
     },
     cache:function(item,name,data){//读写缓存