SVG for Everybody adds SVG External Content support to all browsers.解决ie11不兼容svg的问题，引用此脚本可以解决兼容性问题
使用方法
To use it now, include the script in your document.
<script src="/path/to/svg4everybody.js"></script>
<script>svg4everybody(); // run it now or whenever you are ready</script>
