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CORS跨域时，为何会出现一次动作，两次请求？
source link: https://juejin.im/post/5c46af87e51d4552232feaeb
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提出问题 在开发前后端分离项目时候，我们总会面临一个跨域问题。 众所周知，在以前，跨域可以采用代理、JSONP等方式，而在现代浏览器面前，我们有了更好的选择，CORS。 我们可以通过服务器端设置Access-Control-Allow-Origin响应头，即可
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