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azl397985856 / fe-interview

宇宙最强的前端面试指南 (https://lucifer.ren/fe-interview)
Apache License 2.0
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【每日一题】- 2020-04-04 - core-js是什么？ 平时有用到过么？（直接或者间接） #109

Closed azl397985856 closed 4 years ago

Calvin-for-AI commented 4 years ago

core-js是JavaScript标准库的polyfill,提供了对ES6以后甚至ES5(老版本)的api的兼容写法,例如promise,同时其替代api会识别低端浏览器例如ie8等并进行兼容. 平时不会直接用到(工具库函数一般用lodash),因为没有兼容低端浏览器的需求,但是肯定会间接用到,因为ts-loader要打包成es5代码而引用了babel,babel又引入core.js作全局变量替换

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