高手,救火,在线等....

Question

<script language="JavaScript">
<!--
var d1 = "<%=back_date%>"
d1 = new Date(d1) //注意这里需要转换为yyyy/m/d的格式，或者
d1 = new Date(<%=Year(back_date)%>,<%=Month(back_date)-1%>,<%=Day(back_date)%>)function chk(theForm){ 
d2 = new Date(theForm.take_date.value)
if (d1>d2){
//大于或者小于自己思考
                alert("请输入领料日期!");
                theForm.amount.focus();
                return (false);
        } }
//-->

Answer 1

<script language="JavaScript">
<!--
function chk(theForm){ 
if (theForm.take_date.value=="")
                alert("请输入领料日期!");
                theForm.amount.focus();
                return (false);
        } }
//-->
</script>

Answer 2

if (Date.parse(theForm.take_date.value)< Date.parse(<%=back_date%>))

Answer 3

<script language="JavaScript">
function checkDateEarlier()
{
    var strStart=document.getElementById("take_date").value;
    var strEnd="<%=back_date%>";
    var arr1 = strStart.split("-");
    alert(arr1[1].length);
    var arr2 = strEnd.split("-");
    var date1 = new Date(arr1[0],parseInt(arr1[1].replace(/^0/,""),10) - 1,arr1[2]);
    var date2 = new Date(arr2[0],parseInt(arr2[1].replace(/^0/,""),10) - 1,arr2[2]);
    if (arr1[1].length==1)
       arr1[1] = "0" + arr1[1];
    if (arr1[2].length==1)
        arr1[2] = "0" + arr1[2];
    if (arr2[1].length==1)
        arr2[1] = "0" + arr2[1];
    if (arr2[2].length==1)
        arr2[2]="0" + arr2[2];
    var d1 = arr1[0] + arr1[1] + arr1[2];
    var d2 = arr2[0] + arr2[1] + arr2[2];
    if(parseInt(d1,10)>parseInt(d2,10)){
       //alert("no");
       return false;
      }
    else{
       alert("小于入库日期");
       return true;
     }
 
}//~~~//-->
</script>
<form action="wushou_Add2.asp" method=post id=form1 name=form1 onSubmit="return checkDateEarlier()">
 <input name="take_date" type="text" id="take_date">
<input type="submit" name="Submit" value="添 加" >
</form>