引入 <script src = "https://cdn.polyfill.io/v2/polyfill.min.js"></script>
或 <script type="text/javascript" src ="https://cdn.polyfill.io/v2/polyfill.min.js?features=es6"></script>
参考地址：https://blog.csdn.net/HH921227/article/details/79989430
原文：https://www.cnblogs.com/Mrrabbit/p/9542530.html