PRB: Memory Not Released Using Implicit Assignment With VBScript

MORE INFORMATION

Steps to Reproduce Behavior

Create a new HTML page using the code below. Using Performance Monitor or Windows NT Task Manager, monitor the memory usage of explorer.exe as you perform the following steps:

1. Load the new HTML page into Internet Explorer.
2. Click the button marked "Run JScript."
3. Click the button marked "Run VBScript"

Note the additional memory consumed with each click of the button.

HTML Code Used to Reproduce Behavior

<HTML>
<HEAD>
<SCRIPT Language="VBScript">
   Sub Button1_OnClick()
      For j = 0 to 10000
         t = "Now "
         s = t + "is " + "the " + "time "
         k = s + "for all good men."
      Next
      DisplayVB.innerHTML = "<B>" + k + "</B>"
   End Sub
</SCRIPT>

<SCRIPT LANGUAGE="JScript">
function button2OnClick()
{
   for ( i = 0; i < 10000; ++i ) {
      t = "Now ";
      s = t + "is " + "the " + "time ";
      k = s + "for all good men.";
   }
   DisplayJS.innerHTML = "<B>" + k + "</B>";
}
</SCRIPT>
</HEAD>
<BODY BGColor="#FFFFF0">
   <font face="arial">
   <INPUT TYPE="Button" NAME="Button2" VALUE="Run JScript"
      onClick="button2OnClick()" style="width:100;">
   <BR><BR>
   <SPAN ID=DisplayJS></SPAN>
   <BR><BR>

   <INPUT TYPE="Button" NAME="Button1" VALUE="Run VBScript"
      style="width:100;">
   <BR><BR>
   <SPAN ID=DisplayVB></SPAN>
   <BR><BR>

</BODY>
</HTML>
				

Steps to Resolve

Change the VBScript block in the above sample to read as follows:

<SCRIPT Language="VBScript">
Sub Button1_OnClick()
   Dim j, t, s, k
   For j = 0 to 10000
      t = "Now "
      s = t + "is " + "the " + "time "
      k = s + "for all good men."
   Next
   DisplayVB.innerHTML = "<B>" + k + "</B>"
End Sub
</SCRIPT>
				

Perform the steps above and note that memory consumption does not increase.