1. react React.lazy & import & Suspense
    2. react-loadable
    3. require.ensure

    https://blog.csdn.net/qq_40645154/article/details/122255792

    https://www.jianshu.com/p/462bb9d1c982
    https://www.npmjs.com/package/react-loadable
    https://github.com/jamiebuilds/react-loadable
    https://www.cnblogs.com/cckui/p/11492510.html
    https://zhuanlan.zhihu.com/p/25874892
    https://blog.csdn.net/my_new_way/article/details/106987751
    https://zhuanlan.zhihu.com/p/322093512
    https://segmentfault.com/a/1190000037642108
    https://qa.1r1g.com/sf/ask/3713041321/
    https://www.cnblogs.com/cckui/p/11492510.html