babel-node: command not found

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查阅babel官方文档如下：

@babel/node

The babel-node command in Babel 6 was part of the babel-cli package. In Babel 7, this command has been split out into its own @babel/node package, so if you are using that command, you'll want to add this new dependency.

总之就是说babel-node在7版本，需要单独安装一个叫@babel/node的包
安装后就可以了哈