# import & export

export 将一个文件中定义的变量、函数、类导出，使得其他文件可以调用；其他文件可以使用 import 来导入其他文件导出的变量、函数、类。（import 应该是新语法，传统用法是通过 require 导入一个模块）

## Reference

\[1] <https://developer.mozilla.org/en-US/docs/web/javascript/reference/statements/export>

\[2] <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import>


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