示例1：
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<div class="ballon"></div>
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@keyframes scaleDraw {
0%{
transform: scale(1);
}
25%{
transform: scale(1.1);
}
50%{
transform: scale(1);
}
75%{
transform: scale(1.1);
}
}
.ballon{
width: 150px;
height: 200px;
background: url("images/balloon.png");
background-size: 150px 200px;
-webkit-animation-name: scaleDraw;
-webkit-animation-timing-function: ease-in-out;
-webkit-animation-iteration-count: infinite;
-webkit-animation-duration: 5s;
}
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上面的几个属性也可以合在一起写
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animation: scaleDraw 5s ease-in-out infinite;
-webkit-animation: scaleDraw 5s ease-in-out infinite;
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效果：
实例2：
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<div class="live">
<img src="images/live.png" alt="">
<span></span>
<span></span>
</div>
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.live{
position: relative;
width: 100px;
height: 100px;
}
.live img{
width: 100px;
height: 100px;
z-index: 0;
}
@keyframes living {
0%{
transform: scale(1);
opacity: 0.5;
}
50%{
transform: scale(1.5);
opacity: 0; /*圆形放大的同时，透明度逐渐减小为0*/
}
100%{
transform: scale(1);
opacity: 0.5;
}
}
.live span{
position: absolute;
width: 100px;
height: 100px;
left: 0;
bottom: 0;
background: #fff;
border-radius: 50%;
-webkit-animation: living 3s linear infinite;
z-index: -1;
}
.live span:nth-child(2){
-webkit-animation-delay: 1.5s; /*第二个span动画延迟1.5秒*/
}
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实质就是就是利用了动画的延迟属性，两层圆的动画相关的属性基本相同，除了最外层的圆多设置了animation-delay属性
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