手机号和账号加密，只显示前四位和后四位

  /* 账号手机号加密 */
  function encrypt(value) {
    if (value == "") {
      return "";
    }
    let len = value.length;
    let head = value.substr(0, 4);
    let mid = "****";
    let tail = value.substr(len - 4, 4);
    return head + mid + tail;
  }
  console.log(formataardNo("123456789"), "账号打印");