效果演示：

 实现思路：主要是通过css的stroke相关属性来设置实现的。

 html代码:

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css代码：

.icon1 {/* 填充颜色 */fill: none;/* 图形元素的外轮廓颜色 */stroke: black;/* 图形元素的外轮廓宽度 */stroke-width: 10;/* 两端的形状 */stroke-linecap: round;}@keyframes move {0% {/* 指定线条的长度和间距，第一个参数为长度，第二个为间距 */stroke-dasharray: 0, 600px;}100% {stroke-dasharray: 600px, 0;}}.icon:hover {animation: move 1s;}