Why should settimeout be used in eleui Custom form validation

      var checkAge = (rule, value, callback) => {
        if (!value) {
          return callback(new Error(""));
        }
        setTimeout(() => {
          if (!Number.isInteger(value)) {
            callback(new Error(""));
          } else {
            if (value < 18) {
              callback(new Error("18"));
            } else {
              callback();
            }
          }
        }, 1000);
      };

should be for emulation request
because sometimes we need to confirm to the background whether the user name repeats and other problems

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b222bd-339bf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b222bd-339bf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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