这篇文章主要介绍jpg图片转换成svg文字路径动画的示例，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
用svg+css可以实现一些让人眼前一亮的效果，Ant Design 官网首屏就出现了svg动画，coding
官网首页也出现svg动画，也许在非前端人员看来效果很普通，但是在前端开发人员眼里，这种效果低调而又张扬！这和你做的jq
animate动画一比较，高下立判！你还要说什么？
能做成Ant Design那样的动画效果是我的目标，我想先做个简单点的效果，譬如这样的文字描边动画效果 
怎么做的呢？
这张jpg是我的头像，最终呈现的效果就是以这张图为基础。
首先要在PS中将图的选区转换成路径
再将带路径的ps文件导出到Ai
需要注意的是，第二个字母的路径由两部分组成，外层一个大选区，里面一个小的选区，这里要选“窗口”→“路径查找器”，形状模式选“差集”。
保存成svg格式，得到了代码：
<svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 215 215" style="enable-background:new 0 0 215 215;" xml:space="preserve"><style type="text/css">
.st0{fill-rule:evenodd;clip-rule:evenodd;fill:#30479B;}</style><g>
<path class="st0" d="M197,101c-7.9,2.1-13.8,8.2-25,5c-1.3-7.7-2.7-15.3-4-23c2.3-2.3,4.7-4.7,7-7c5.5-1.6,11.3-3.4,15,1
c4.5-1.4,3.6-0.5,5-5c-3.7-1.7-7.3-3.3-11-5c-10.1,4.6-14.5,6.3-22,12c1.3,9.7,2.7,19.3,4,29c3.8,6.1,18.2,5.6,26,3
c4.1-2,5-3.9,7-8C198.3,102.3,197.7,101.7,197,101z"/>
<path class="st0" d="M144,73c-1.3,0-2.7,0-4,0c-2.3,1-4.7,2-7,3c1.3,5.3,2.7,10.7,4,16c3.3-1,6.7-2,10-3
C148.1,83.3,145.3,79.1,144,73z"/>
<path class="st0" d="M126,84c-10,0-20,0-30,0c1.3,14,2.7,28,4,42c2,0,4,0,6,0c-1-11.3-2-22.7-3-34c0.7-0.3,1.3-0.7,2-1
c5.3,0,10.7,0,16,0c3,10,6,20,9,30c1.2,3.1,2,1.2,6,1c-3.3-12-6.7-24-10-36C126,85.3,126,84.7,126,84z"/>
<path class="st0" d="M18,97c0.3,4.7,0.7,9.3,1,14c9,0.7,18,1.3,27,2c0.3,3,0.7,6,1,9c-7.7,0-15.3,0-23,0c0,1.7,0,3.3,0,5
c5,0.7,10,1.3,15,2c4.3,0,8.7,0,13,0c0.7-6.3,1.3-12.7,2-19c-4.2-4-20.4-4.2-28-4c-0.3-2.3-0.7-4.7-1-7c7.8-5.5,19.4-2.3,29-5
c0.7,0,1.3,0,2,0c0-2,0-4,0-6C34.4,87.6,30.9,88,18,97z"/>
<path class="st0" d="M146,96c-1.7,0.7-3.3,1.3-5,2c-2.1,11.1,6.7,23,9,34c3.4,0.8,5.1,0.7,8-1c1-0.3,2-0.7,3-1
c-3.3-11.3-6.7-22.7-10-34C149.3,96,147.7,96,146,96z"/>
<path class="st0" d="M57,122c2.7,8.7,5.3,17.3,8,26c9.5,1.9,19.2-5.2,28-8c1.2-5.9-0.6-23.6-5-29C77.7,114.7,67.3,118.3,57,122z
M70,141c-1.7-4.3-3.3-8.7-5-13c5.7-2.7,11.3-5.3,17-8c2.5,2.4,2.9,5,4,9C85.8,138.6,78.7,140.6,70,141z"/></g></svg>
将css修改一下
.st0{fill: none;
stroke-width:2;
stroke:#30479B;
stroke-linejoin:round;
stroke-linecap:round;
stroke-dasharray: 250, 250;
animation: lineMove 5s ease-out infinite;
}
@keyframes lineMove {
0%{
stroke-dasharray: 0, 250;
}
100%{
stroke-dasharray: 250, 250;
}
}
关于svg和css相结合，以本示例为参考：
– fill 表示填充颜色，值是none表示没有颜色
– stroke 是边框的颜色
– stroke-width 定义边框的厚度
– stroke-dasharray 这个属性第一个参数定义了边框虚线长度，第二个参数是虚线的间距，什么是“边框虚线”，你可以认为边框本来就是虚线而不是实线，只不过虚线的间距为0，看起来就像是实线了。
– 这里用到了css3的@keyframes特性，将过渡动画控制stroke-dasharray 样式。
最终整体代码如下
<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
svg{width: 250px;height: 250px;}
</style></head><body style="background: #f1f1f1">
<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 21.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 215 215" style="enable-background:new 0 0 215 215;" xml:space="preserve">
<style type="text/css">
.st0{fill: none;
stroke-width:2;
stroke:#30479B;
stroke-dasharray: 250;
animation: lineMove 5s ease-out infinite;
}
@keyframes lineMove {
0%{
stroke-dasharray: 0, 250;
}
100%{
stroke-dasharray: 250, 250;
}
}
</style>
<g>
<path class="st0" d="M197,101c-7.9,2.1-13.8,8.2-25,5c-1.3-7.7-2.7-15.3-4-23c2.3-2.3,4.7-4.7,7-7c5.5-1.6,11.3-3.4,15,1
c4.5-1.4,3.6-0.5,5-5c-3.7-1.7-7.3-3.3-11-5c-10.1,4.6-14.5,6.3-22,12c1.3,9.7,2.7,19.3,4,29c3.8,6.1,18.2,5.6,26,3
c4.1-2,5-3.9,7-8C198.3,102.3,197.7,101.7,197,101z"/>
<path class="st0" d="M144,73c-1.3,0-2.7,0-4,0c-2.3,1-4.7,2-7,3c1.3,5.3,2.7,10.7,4,16c3.3-1,6.7-2,10-3
C148.1,83.3,145.3,79.1,144,73z"/>
<path class="st0" d="M126,84c-10,0-20,0-30,0c1.3,14,2.7,28,4,42c2,0,4,0,6,0c-1-11.3-2-22.7-3-34c0.7-0.3,1.3-0.7,2-1
c5.3,0,10.7,0,16,0c3,10,6,20,9,30c1.2,3.1,2,1.2,6,1c-3.3-12-6.7-24-10-36C126,85.3,126,84.7,126,84z"/>
<path class="st0" d="M18,97c0.3,4.7,0.7,9.3,1,14c9,0.7,18,1.3,27,2c0.3,3,0.7,6,1,9c-7.7,0-15.3,0-23,0c0,1.7,0,3.3,0,5
c5,0.7,10,1.3,15,2c4.3,0,8.7,0,13,0c0.7-6.3,1.3-12.7,2-19c-4.2-4-20.4-4.2-28-4c-0.3-2.3-0.7-4.7-1-7c7.8-5.5,19.4-2.3,29-5
c0.7,0,1.3,0,2,0c0-2,0-4,0-6C34.4,87.6,30.9,88,18,97z"/>
<path class="st0" d="M146,96c-1.7,0.7-3.3,1.3-5,2c-2.1,11.1,6.7,23,9,34c3.4,0.8,5.1,0.7,8-1c1-0.3,2-0.7,3-1
c-3.3-11.3-6.7-22.7-10-34C149.3,96,147.7,96,146,96z"/>
<path class="st0" d="M57,122c2.7,8.7,5.3,17.3,8,26c9.5,1.9,19.2-5.2,28-8c1.2-5.9-0.6-23.6-5-29C77.7,114.7,67.3,118.3,57,122z
M70,141c-1.7-4.3-3.3-8.7-5-13c5.7-2.7,11.3-5.3,17-8c2.5,2.4,2.9,5,4,9C85.8,138.6,78.7,140.6,70,141z"/>
</g>
</svg>
</body>
</html>