前端离线缓存service worker

学习地址：https://www.bilibili.com/video/BV1fW4y1q7qt?spm_id_from=333.788.videopod.sections&vd_source=2fdf156def7c5283b54dd07021e8099f

https://www.bilibili.com/video/BV1dt411975q?spm_id_from=333.788.recommend_more_video.2&vd_source=2fdf156def7c5283b54dd07021e8099f