//downloadSaveFile.js

/**
 * 下载单个文件
 * @param {string} [type]
 * @param {string} url
 * @callback successCallback
 * @callback failCallback
 */
function downloadFile(type, url, successc, failc) {
  checkAuth(() => {
    wx.showLoading({
      title: '正在下载',
      mask: true
    })
    downloadSaveFile(
      type,
      url,
      () => {
        wx.hideLoading();
        wx.showToast({
          title: '下载成功',
          icon: 'none',
        })
        successc && successc();
      },
      (errMsg) => {
        wx.hideLoading();
        wx.showToast({
          title: errMsg,
          icon: 'none',
        })
        failc && failc();
      }
    );
  })
}

/**
 * 下载多个文件
 * @param {string} [type]
 * @param {string[]} urls
 * @callback completeCallback
 */
function downloadFiles(type, urls, completec) {
  let success = 0;
  let fail