How can setting [Update Link when Saving Document] =True?

I want add TextFrame is link content to TextFrame 1 and allow auto update when save file.

I had try setting linkedPageItemOptions.updateLinkWhileSaving=true; But it not ok.

This is my code:

var doc=app.documents[0];
var txt_base=doc.pages[0].textFrames[0];
var oPage=doc.pages[0];
var oBounds= txt_base.visibleBounds;
for(var i=1;i<4;i++)
{
var page2=doc.pages.add();
var txt2=page2.textFrames.add();
txt2.contentPlace(txt_base,true,true);
txt2.linkedPageItemOptions.updateLinkWhileSaving=true;
txt2.visibleBounds=oBounds;
}

How can setting [Update Link when Saving Document] =True?