code: function BaiduCloudStorage(ak, sk, maxSize, opt_autoUri) {
      this.ak = ak;
      this.sk = sk;
      this.maxSize = maxSize;
      this.autoUri = !!opt_autoUri;
  }
docs: /* jshint camelcase: false 
  @constructor
  @param {string} ak The AccessKey.
  @param {string} sk The SecretKey.
  @param {number} maxSize The max file size.
  @param {boolean=} opt_autoUri 是否自动添加md5的后缀.