function - 错误 '800a005e' 无效使用 Null : 'CDate' when using a function in ASP Classic-VBScript

Question

我创建了一个名为 FormatDT 的函数，并将其放在 \include\basic_function.asp

这是该函数的代码:

function FormatDT(ddate,format)
        ddate = cdate(ddate)
        Set re = New RegExp
        re.Pattern = "%."
        re.Global = True
        re.IgnoreCase = False
        're.MultiLine = True
        set matches = re.execute(format)
        hasil = ""
        tmp = format
        for each match in matches
            fmt = match.value
            select case fmt
                case "%d" hasil = day(ddate)
                case "%D" hasil = right("00" & day(ddate),2)
                case "%m" hasil = month(ddate)
                case "%M" hasil = right("00" & month(ddate),2)
                case "%b" hasil = left(MonthName(month(ddate)),3)
                case "%B" hasil = MonthName(month(ddate))
                case "%y" hasil = right(year(ddate),2)
                case "%Y" hasil = year(ddate)
                case "%h" hasil = hour(ddate)
                case "%H" hasil = right("00" & hour(ddate),2)
                case "%n" hasil = minute(ddate)
                case "%N" hasil = right("00" & minute(ddate),2)
                case "%s" hasil = second(ddate)
                case "%S" hasil = right("00" & second(ddate),2)
                case else hasil = replace(fmt,"%","")
            end select
            tmp = replace(tmp,fmt,hasil)
        next
        FormatDT = tmp
    end function

我在这里使用这个函数:

<input style="text-align:center" class="label" style="width:6em;" type="text" id="txtDate" name="txtDate" size="12" value="<%=FormatDt(dtglvalid,"%M/%D/%Y")%>" >

当我加载页面时，我收到如下错误消息:

Microsoft VBScript runtime error '800a005e' Invalid use of Null: 'cDate'
/include/basic_function.asp, line 234

第 234 行位于 ddate = cdate(ddate)

如何解决这个错误？

Answer 1

ASP 提示变量 ddate 为 NULL。查看您的代码，变量 dtglvalid 看起来像是 NULL，它被传递给函数并导致错误。你可以这样做:

<input ... value="<% if not IsNull(dtglvalid) then Response.Write FormatDt(dtglvalid,"%M/%D/%Y") %>">