前端学习（2136）：使用es6模块化出现Access to script at ‘file:///... ..from origin ‘null‘ has been blocked。。。错误

为什么会跨域？

因为你是在本地打开的文件，而file协议并不支持
http, data, chrome, chrome-extension, https这些协议是支持跨域请求的
而当你在某盘符位置下直接打开一个网页(script标签中引入了某地的某个js文件)，则在浏览器地址栏呈现如下：file:///D:/MyStudyProject/JSTopLevel/chapter-9/2%E5%AF%BB%E6%89%BE%E5%AD%97%E7%AC%A6%E4%B8%B2%E9%87%8C%E5%B8%A6%E5%BC%95%E5%8F%B7%E7%9A%84%E5%AD%97%E7%AC%A6%E4%B8%B2.html，则会出现跨域问题。而http、https等协议支持跨域请求。
所以解决办法就是通过搭建本地一个服务器去进行资源的问题来解决跨域问题。

解决方法：

通过搭建本地一个服务器去进行资源的问题来解决跨域问题

例如：node 打开
例如：phpStydy 打开

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前端学习（2136）：使用es6模块化出现Access to script at ‘file:///... ..from origin ‘null‘ has been blocked。。。错误

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