[vue] Have you used the babel-polyfill module? What is it mainly used for?

[vue] Have you used the babel-polyfill module? What is it mainly used for?

Babel默认只转换新的JavaScript句法（syntax），而不转换新的API，比如Iterator、Generator、Set、Maps、Proxy、Reflect、Symbol、Promise等全局对象，以及一些定义在全局对象上的方法（比如Object.assign）都不会转码。

举例来说，ES6在Array对象上新增了Array.from方法。Babel就不会转码这个方法。如果想让这个方法运行，必须使用babel-polyfill，为当前环境提供一个垫片。

Babel默认不转码的API非常多，详细清单可以查看babel-plugin-transform-runtime模块的definitions.js文件。

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