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(0);
    -moz-transform:scale(0);
    -webkit-transform:scale(0);

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="images/06_03.png"   class="mdmobile-second-one-top-top"/>
                <img src="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="images/07_03.png"  class="mdmobile-second-one-middle-top-left"/>
                    <img src="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="images/07_09.png"  class="mdmobile-second-one-middle-middle-one"/>
                    <img src="images/07_11.png"   class="mdmobile-second-one-middle-middle-two"/>
                    <img src="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="images/07_16.png"  class="mdmobile-second-one-middle-foot-left"/>
                    <img src="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 {
    0% {transform:scale(0.2);}
    100% {transform:scale(1.0);}
}
@-moz-keyframes  suofang {
    0% {-moz-transform:scale(0.2);}
    100% {-moz-transform:scale(1.0);}
}
@-webkit-keyframes  suofang {
    0% {-webkit-transform:scale(0.2);}
    100% {-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(0);
    -moz-transform:scale(0);
    -webkit-transform:scale(0);
}

if(index == 2){
                $(".mdmobile-second-one-middle-top-left").addClass("active");
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-top-right").addClass("active");
                },100);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-middle-one").addClass("active");
                },200);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-middle-two").addClass("active");
                },300);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-middle-three").addClass("active");
                },400);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-foot-left").addClass("active");
                },500);
                setTimeout(function(){
                    $(".mdmobile-second-one-middle-foot-right").addClass("active");
                },600);
            }