The front end converts the file to base64 format

The front end converts the uploaded file to base64 format

// 封装文件转 base64 格式方法
toBase64(file) {
    
    
  return new Promise((resolve,reject)=>{
    
    
    const fileReader = new FileReader();
      fileReader.onload = (e) => {
    
    
        resolve(e.target.result);
      };
      fileReader.readAsDataURL(file); // file 或 raw
      fileReader.onerror = () => {
    
    
        reject(new Error('文件流异常'));
      };
      console.log('fileReader----', fileReader)
  })
}

// 上传驾驶证照片
jszxszUpload(type) {
    
    
  console.log('"上传驾驶证"----', "上传驾驶证")
  uni.chooseImage({
    
    
    success: async (imageRes) => {
    
    
      console.log('imageRes----', imageRes)
      this[type + 'ImgSrc'] = imageRes.tempFilePaths[0]
      // 【将文件转为 base64 格式】
      let fileBase64 = await this.toBase64(imageRes.tempFiles[0])
      console.log('fileBase64----', fileBase64)
    },
  })
},