学习地址:https://www.cnblogs.com/gavinjay/p/8582137.html
用到的小程序API:https://developers.weixin.qq.com/miniprogram/dev/api/canvas/wx.canvasToTempFilePath.html
学习地址:https://www.cnblogs.com/gavinjay/p/8582137.html
用到的小程序API:https://developers.weixin.qq.com/miniprogram/dev/api/canvas/wx.canvasToTempFilePath.html