也许你也有这个疑惑，动画一直在播放，那它不显示出来的时候也一直在播放的话，那是否一直占用资源呢？
1 <!doctype html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <title>Test TS Serializer</title> 6 <style> 7 .loadings { 8 width: 120px; 9 height: 120px; 10 /* background: #FFFFFF; */ 11 border-radius: 3px; 12 position: absolute; 13 /* display: none; none的时候不耗性能 */ 14 } 15 16 .loadings .loadings-img.rotateActive { 17 -webkit-animation: animations 1s ease-out infinite; 18 -moz-animation: animations 1s ease-out infinite; 19 animation: animations 1s ease-out infinite; 20 } 21 22 .loadings .loadings-img { 23 width: 32px; 24 height: 32px; 25 background: url(loading.png) no-repeat; 26 position: absolute; 27 left: 0; 28 right: 0; 29 margin: auto; 30 top: 0; 31 bottom: 0; 32 /* transform: rotate(3600deg); */ 33 } 34 @keyframes animations{ 35 0%{-webkit-transform:rotate(0deg)} 36 10%{-webkit-transform:rotate(36deg)} 37 20%{-webkit-transform:rotate(72deg)} 38 30%{-webkit-transform:rotate(108deg)} 39 40%{-webkit-transform:rotate(144deg)} 40 50%{-webkit-transform:rotate(180deg)} 41 60%{-webkit-transform:rotate(216deg)} 42 70%{-webkit-transform:rotate(254deg)} 43 80%{-webkit-transform:rotate(290deg)} 44 90%{-webkit-transform:rotate(326deg)} 45 100%{-webkit-transform:rotate(360deg)} 46 } 47 </style> 48 </head> 49 50 <body> 51 <div class="loadings" style="top:0px"> 52 <div class="loadings-img rotateActive"> 53 </div> 54 </div> 55 <div class="loadings" style="top:20px"> 56 <div class="loadings-img rotateActive"> 57 </div> 58 </div> 59 <div class="loadings" style="top:40px"> 60 <div class="loadings-img rotateActive"> 61 </div> 62 </div> 63 <div class="loadings" style="top:60px"> 64 <div class="loadings-img rotateActive"> 65 </div> 66 </div> 67 <div class="loadings" style="top:80px"> 68 <div class="loadings-img rotateActive"> 69 </div> 70 </div> 71 <div class="loadings" style="top:100px"> 72 <div class="loadings-img rotateActive"> 73 </div> 74 </div> 75 <div class="loadings" style="top:120px"> 76 <div class="loadings-img rotateActive"> 77 </div> 78 </div> 79 <div class="loadings" style="top:140px"> 80 <div class="loadings-img rotateActive"> 81 </div> 82 </div> 83 </script> 84 </body> 85 </html>
运行这个html，监视任务管理器，发现在display:none 注释后性能下降至0，说明CSS3的动画效果不显示的时候是不消耗性能的。