一 实现背景图循环播放

@keyframes mlfly {
0%{
background-position:0 0;
}
100%{
background-position:210px 0;
}
}
.ele-man{
width:70px;
position:absolute;
top: 30px;
left:50%;
margin-left:-35px;
background-image: url("m1-man.32@2x.png");
background-size:210px 163px;
height:163px;
-webkit-transform-style: preserve-3d;
transform-style: preserve-3d;
animation:mlfly .2s steps(3,start) .5s infinite alternate;
}
</style>
</head>
<body>
<div class="ele-man"></div>
</body>

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" 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实现火箭火苗动的效果 实际背景图有三个

aaarticlea/png;base64,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" 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通过循环播放三个背景图达到动画效果

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