export function randomStr(len = 32) {
  /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
  const $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';
  const maxPos = $chars.length;
  let pwd = '';

  for (let i = 0; i < len; i++) {
    pwd += $chars.charAt(Math.floor(Math.random() * maxPos));
  }
  return pwd;
}