文本框只能输入数字

//文本框只能输入数字

<script>
    function ValidateNumber(e, pnumber) {
        if (!/^\d+$/.test(pnumber)) {
            $(e).val(/^\d+/.exec($(e).val()));
        }
        return false;
    }
</script>

 @Html.TextBox("ESurvivalTime", (string)ViewBag.ESurvivalTime, new { @class = "txt3", @style = " width : 100px", onkeyup = "return ValidateNumber($(this),value)" })