获得更改购买数量：
<!--webbot   BOT= "GeneratedScript "   PREVIEW= "   "   startspan   --> <script   Language= "JavaScript "> <!--
function   FrontPage_Form1_Validator(theForm)
{

    var   checkOK   =   "0123456789- ";
    var   checkStr   =   theForm. <%= "Q_ "   &   rs( "Product_Id ")%> .value;
    var   allValid   =   true;
    var   decPoints   =   0;
    var   allNum   =   " ";
    for   (i   =   0;     i   <   checkStr.length;     i++)
    {
        ch   =   checkStr.charAt(i);
        for   (j   =   0;     j   <   checkOK.length;     j++)
            if   (ch   ==   checkOK.charAt(j))
                break;
        if   (j   ==   checkOK.length)
        {
            allValid   =   false;
            break;
        }
        allNum   +=   ch;
    }
    if   (!allValid)
    {
        alert( "在   请输入正确的商品数量！   域中，只能输入   数字   个字符。 ");
        theForm. <%= "Q_ "   &   rs( "Product_Id ")%> .focus();
        return   (false);
    }
    return   (true);
}
//--> </script> <!--webbot   BOT= "GeneratedScript "   endspan   -->
<form   Action= "eshop.asp "   Method= "POST "   onsubmit= "return   FrontPage_Form1_Validator(this) "   name= "FrontPage_Form1 ">
            <input   type= "hidden "   name= "MySelf "   value= "Yes ">
<div   align= "center "> <center>
<table   border= "0 "   cellspacing= "1 "   width= "550 "   class=main   bgcolor= "#000000 "> ...........

’得到购买数量：
Quatity   =   CInt(   Request(   "Q_ "   &   rs( "Product_Id "))   )
......


FrontPage_Form1_Validator(this)       '这this是什么意思？
还有下面两句是什么意思？ "Q_ "   是什么数值？先谢谢啦
    var   checkOK   =   "0123456789- ";
    var   checkStr   =   theForm. <%= "Q_ "   &   rs( "Product_Id ")%> .value;

------解决方案--------------------
1, <form Action= "eshop.asp " Method= "POST " onsubmit= "return FrontPage_Form1_Validator(this) " name= "FrontPage_Form1 ">
this 指当前对象，等于 document.FrontPage_Form1

2,var checkOK = "0123456789- ";

定义一个变量，这个变量的值是一个字符串 "0123456789- "

3，var checkStr = theForm. <%= "Q_ " & rs( "Product_Id ")%> .value;
Q_是