缓存布局信息

 1 ;(function(global){
 2         var wind = document.getElementById("wind"), count = 0;
 3 
 4         function marque(){
 5             console.log("wind.offsetTop:",wind.offsetTop,"wind.offsetLeft::",wind.offsetLeft);
 6 
 7 
 8             /*wind.style.left = 12 + wind.offsetLeft + "px";
 9             wind.style.top = 1 + wind.offsetTop + "px";
10             console.log("wind.offsetTop:",wind.offsetTop,"wind.offsetLeft::",wind.offsetLeft);*/
11 
12             // 上面会不停得计算 offsetLeft offsetTop ，不停得查询，导致浏览器刷新渲染而不利于优化
13             // 就是 缓存布局信息啦
14             count++;
15             wind.style.top = count + "px";
16             wind.style.left = count + "px";
17 
18             if(wind.offsetTop >= 200){
19                 //stopAnimation();
20                 console.log(111)
21                 
22                 clearInterval(timer);
23             }
24         }
25 
26         timer = setInterval(marque,20);
27         console.log(wind.offsetTop)
28         
29     })(this)
疯癫不成狂，有酒勿可尝；世间良辰美，终成水墨白。