上传图片到OSS

 _uploadFile(filePath, index) {
    let result = {};
    const { policy } = app.globalData;
    const formData = {
      key: policy.directory + filePath, //在开发者工具里检测 注意
      // 'key': policy.directory + filePath.replace('wxfile://', ''), //在手机上检测 注意
      policy: policy.policy,
      OSSAccessKeyId: policy.accessID,
      success_action_status: "200",
      signature: policy.signature,
      callback: policy.callback
    };
    console.log(formData);
    const { resultCode, detail } = upload.promisify(wx.uploadFile)({
      url: `${policy.host}`, //开发者服务器 url
      filePath, //要上传文件资源的路径
      name: "file", //文件对应的 key，开发者在服务端可以通过这个 key 获取文件的二进制内容
      formData: {
        key: policy.directory + filePath, //在开发者工具里检测 注意
        // 'key': policy.directory + filePath.replace('wxfile://', ''), //在手机上检测 注意
        policy: policy.policy,
        OSSAccessKeyId: policy.accessID,
        success_action_status: "200",
        signature: policy.signature,
        callback: policy.callback
      }
    });
    if (resultCode) {
      console.log("失败1");
      const url = policy.host + "/" + policy.directory + filePath;
      result = { ...JSON.parse(detail.data), resultCode: "OK", url };
    } else {
      console.log("失败2");
      result = { resultCode: "FAIL" };
    }
    return result;
  },