前台js根據當前時間生成訂單號

*********前台顯示框****************

  <input type="text" id="WIDout_trade_no" name="WIDout_trade_no" />

**************js代碼*****************

<script language="javascript">

 function GetDateNow()
    {
        var vNow = new Date();
        sNow += String(vNow.getFullYear());
        sNow += String(vNow.getMonth() + 1);
        sNow += String(vNow.getDate());
       sNow += String(vNow.getHours());
        sNow += String(vNow.getMinutes());
        sNow += String(vNow.getSeconds());
        sNow += String(vNow.getMilliseconds());
        document.getElementById("WIDout_trade_no").value = sNow;
    }

    GetDateNow();

</script>