Why display message confirm save after ExecuteThisJavascript?

i had try move to outside loop:

Dim formApp As AFORMAUTLib.AFormApp

formApp = CreateObject("AFormAut.App")     

Dim fields As AFORMAUTLib.Fields

ields = formApp.Fields

result: i run time 1 it is ok.

But if i run again, it will show message confirm save, after ExecuteThisJavascript some Pages.

this my script:

//for (var p = 0; p < this.numPages; p++)

//{

    var numWords = this.getPageNumWords(p);

var bLink=false;

    for (var i=0; i<numWords; i++)

    {

            var ckWord = this.getPageNthWord(p, i, false);

            if ( ckWord == "P."))

            {

var q = this.getPageNthWordQuads(p, i);

m = (new Matrix2D).fromRotated(this,p);

mInv = m.invert();

r = mInv.transform(q);

r=r.toString();

r = r.split(",");

var q2 = this.getPageNthWordQuads(p, i+1);

m2 = (new Matrix2D).fromRotated(this,p);

mInv2 = m2.invert()

r2 = mInv.transform(q2);

r2=r2.toString();

r2 = r2.split(",");

l = addLink(p, [r[4], r[5], r2[2], r2[3]]);

l.borderColor = color.red;

l.borderWidth = 1;

l.setAction("this.pageNum = 1" );

            }

    }

//}