function Students_Save() {
    var z = /^[0-9]*$/;
    var strPreAddedValue = $("#PreIncreaseQty").val();
    var orderQty = $("#OrderQty").val();
    if (strPreAddedValue != undefined) {
        if (!z.test(strPreAddedValue)) {
            $.messager.alert("系统提示", "填写的数据格式应为正整数！");
            return;
        }
        $(document.forms[0]).submit();
    }
    else if (orderQty != undefined) {
        if (!z.test(orderQty)) {
            $.messager.alert("系统提示", "填写的数据格式应为正整数！");
            return;
        }
        $(document.forms[0]).submit();
    }  
}