css3简易实现图标动画由小到大逐个显现

在制作网站时避免图片太平淡经常会用到动画效果：由小到大跳跃出现。这种效果很有视觉冲击力，显著提高关注度~

原理：利用css3的动画属性@keyframes@-moz-keyframes@-webkit-keyframes定义动画suofang,再用animation调用suofang这一动画帧，并将动画添加到图片上，需要注意的是需要给图片相当于初始化的一个处理

transform:scale();
    -moz-transform:scale();
    -webkit-transform:scale();

最后在js中调用css动画。对于不同的页面，需要使用index来标注不同的页面。

 <!--第二屏开始-->
     <div class="section">
         <div class="mdmobile-second-one">
             <div class="mdmobile-second-one-top">
                 <img src="data:images/06_03.png"   class="mdmobile-second-one-top-top"/>
                 <img src="data:images/06_07.png"   class="mdmobile-second-one-top-foot"/>
             </div>

             <div class="mdmobile-second-one-middle">
                 <div class="mdmobile-second-one-middle-top">
                     <img src="data:images/07_03.png"  class="mdmobile-second-one-middle-top-left"/>
                     <img src="data:images/07_05.png"   class="mdmobile-second-one-middle-top-right"/>
                     <div class="clear"></div>
                 </div>
                 <div class="mdmobile-second-one-middle-middle">
                     <img src="data:images/07_09.png"  class="mdmobile-second-one-middle-middle-one"/>
                     <img src="data:images/07_11.png"   class="mdmobile-second-one-middle-middle-two"/>
                     <img src="data:images/07_13.png"  class="mdmobile-second-one-middle-middle-three"/>
                     <div class="clear"></div>
                 </div>
 　　　　　　　　　　<div class="mdmobile-second-one-middle-foot">
                     <img src="data:images/07_16.png"  class="mdmobile-second-one-middle-foot-left"/>
                     <img src="data:images/07_18.png"  class="mdmobile-second-one-middle-foot-right"/>
                     <div class="clear"></div>
                 </div>
             </div>
             <div class="mdmobile-second-one-foot">
             </div>
         </div>
     </div>
     <!--第二屏结束-->

 /*第二屏开始*/

 @keyframes  suofang {
     % {transform:scale(0.2);}
     % {transform:scale(1.0);}
 }
 @-moz-keyframes  suofang {
     % {-moz-transform:scale(0.2);}
     % {-moz-transform:scale(1.0);}
 }
 @-webkit-keyframes  suofang {
     % {-webkit-transform:scale(0.2);}
     % {-webkit-transform:scale(1.0);}
 }
 .mdmobile-second-one-middle-top-right.active,
 .mdmobile-second-one-middle-top-left.active,
 .mdmobile-second-one-middle-middle-one.active,
 .mdmobile-second-one-middle-middle-two.active,
 .mdmobile-second-one-middle-middle-three.active,
 .mdmobile-second-one-middle-foot-left.active,
 .mdmobile-second-one-middle-foot-right.active
 {
     animation: suofang 1s forwards;
     -moz-animation: suofang 1s forwards;
     -webkit-animation: suofang 1s forwards;
 }
 .mdmobile-second-one-middle-top-right,
 .mdmobile-second-one-middle-top-left,
 .mdmobile-second-one-middle-middle-one,
 .mdmobile-second-one-middle-middle-two,
 .mdmobile-second-one-middle-middle-three,
 .mdmobile-second-one-middle-foot-left,
 .mdmobile-second-one-middle-foot-right
 {
     transform:scale();
     -moz-transform:scale();
     -webkit-transform:scale();
 }

if(index == ){
                $(".mdmobile-second-one-middle-top-left").addClass("active");
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-top-right").addClass("active");
                },);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-middle-one").addClass("active");
                },);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-middle-two").addClass("active");
                },);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-middle-three").addClass("active");
                },);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-foot-left").addClass("active");
                },);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-foot-right").addClass("active");
                },);
            }