async drawCanvas() { const ctx = uni.createCanvasContext('canvas', this); // 绘制背景图 var path = await this.getImageInfoPromise('https://fyqgsm.top/static/wifi/bj1.jpg'); const canvasWidthPx = uni.upx2px(this.canvasWidth); const canvasHeightPx = uni.upx2px(this.canvasHeight); ctx.drawImage(path, 0, 0, canvasWidthPx, canvasHeightPx); // 绘制固定位置的图片 ctx.drawImage(this.qrcode, canvasWidthPx / 6, canvasHeightPx / 5, canvasWidthPx / 6 * 4, canvasWidthPx / 6 * 4); // 在(50, 50)位置绘制一张100x100的图片 // 绘制完成后，调用draw方法进行渲染 ctx.draw(); }, this.qrcode = 'data:image/jpeg;base64,' + res.response; this.qrcode 为base64图片在手机上无法显示，path远程图片正常可以显示