js向页面中动态添加脚本
var head= document.getElementsByTagName('head')[0];
var script= document.createElement('script');
script.type= 'text/javascript';
script.src= 'https://d3js.org/d3.v5.min.js';
head.appendChild(script);
<script type="text/javascript" src="https://d3js.org/d3.v5.min.js"></script>