https://www.bilibili.com/video/BV1s64y1S7em/?spm_id_from=333.337.search-card.all.click
https://www.bilibili.com/video/BV1NQ4y1z71j/?spm_id_from=333.337.search-card.all.click
下面这个视频虽然是汽车的 但是跟电动车的方法也差不多
https://www.bilibili.com/video/BV14j41117zN/?spm_id_from=333.337.search-card.all.click