有时需要将网上的图片转存到自己的七牛云，避免网络资源失效。

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const qiniu = require("qiniu");
var accessKey = "你的 ak";
var secretKey = "你的 sk";
var bucket = "你的 bucket";
var mac = new qiniu.auth.digest.Mac(accessKey, secretKey);
var config = new qiniu.conf.Config();
// 空间对应的机房 华东
config.zone = qiniu.zone.Zone_z0;
var bucketManager = new qiniu.rs.BucketManager(mac, config);
/**
 *
 * @param {String} _url 网络图片地址
 * @param {String} _key 上传后叫啥名
 * @returns {String} 七牛云的链接地址
 */
export async function uploadAvatarToQiniu(_url, _key) {
  let res = await resToQiniu(_url, bucket, _key);
  return "https://usercontents.authing.cn/" + res.data.key;
}

function resToQiniu(resUrl, bucket, key) {
  return new Promise((resolve, reject) => {
    bucketManager.fetch(resUrl, bucket, key, function(err, respBody, respInfo) {
      if (err) {
        reject(err);
        //throw err;
      } else {
        if (respInfo.statusCode == 200) {
          resolve({ code: 200, data: respBody });
        } else {
          reject({ code: respInfo.statusCode, data: respBody });
        }
      }
    });
  });
}

// (async () => {
//   let res = await uploadAvatarToQiniu('https://developer.qiniu.com/assets/android@2x-3522db9ece087f177f28996c410b098e60575ede6bec2073634cc183c686d417.png', 'goodgood.png')
//   console.log(res)
// })()