wx.canvasGetImageData({ canvasId: "shopCanvas", x: 0, y: 0, width: width, height: height, success(res) { console.log("canvas:图片",res.data); let pngData = upng.encode([res.data.buffer], res.width, res.height) let base64 = wx.arrayBufferToBase64(pngData); imgBase64 = 'data:image/png;base64,' + base64; } })