wx.getImageInfo({ src: result, success: function (res) { let originWidth, originHeight; originHeight = res.height; originWidth = res.width; console.log("the origin width:" + originWidth + " the origin height:" + originHeight); //压缩比例 // 最大尺寸限制 let maxWidth = 300, maxHeight = 100; // 目标尺寸 let targetWidth = originWidth, targetHeight = originHeight; //等比例压缩，如果宽度大于高度，则宽度优先，否则高度优先 if (originWidth > maxWidth || originHeight > maxHeight) { if (originWidth / originHeight > maxWidth / maxHeight) { // 要求宽度*(原生图片比例)=新图片尺寸 targetWidth = maxWidth; targetHeight = Math.round(maxWidth * (originHeight / originWidth)); } else { targetHeight = maxHeight; targetWidth = Math.round(maxHeight * (originWidth / originHeight)); } } //更新canvas大小 that.setData({ cw: targetWidth, ch: targetHeight }); const query = wx.createSelectorQuery() query.select('#zipCanvas') .fields({ node: true, size: true }) .exec(async res => { // 获取 canvas 实例 const canvas = res[0].node // 获取 canvas 绘图上下文 const ctx = canvas.getContext('2d') // 根据设备dpr处理尺寸 const dpr = wx.getSystemInfoSync().pixelRatio canvas.width = targetWidth * dpr canvas.height = targetHeight * dpr console.log('canvas.width, canvas.height', canvas.width, canvas.height) ctx.scale(dpr, dpr) // 将图片绘制到 canvas ctx.drawImage(result, 0, 0, targetWidth, targetHeight) setTimeout(function () { // 将canvas图片上传到微信临时文件 wx.canvasToTempFilePath({ canvas, x: 0, y: 0, destWidth: targetWidth, destHeight: targetHeight, complete(res) { if (res.errMsg === 'canvasToTempFilePath:ok') { // 返回临时文件路径 that.uploadImg(res.tempFilePath) } }, fail(err) { wx.hideLoading(); wx.showToast({ title: '电子签名压缩失败', icon: 'none', duration: 2000 }); } }) }, 1000); }) } }) 拿到的图片为空白，请大佬帮帮解决一下，多谢！！！

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/phonenumber/phonenumber.getPhoneNumber.html 后台获取用户手机号信息时，报如下提示信息： “”不是支持的编码名。有关定义自定义编码的信息，请参阅关于 Encoding.RegisterProvider 方法的文档。 参数名: name