<frameset id="fr" rows="50%,50%">
<frame name="up" id="up" src="u.html"/>
<frame name="down" id="down" src="d.html"/>
</frame>
var objValue=window.parent.frames["down"].document.getElementById("456");
alert(objValue.value);
2023-02-25 15:55:09
<frameset id="fr" rows="50%,50%">
<frame name="up" id="up" src="u.html"/>
<frame name="down" id="down" src="d.html"/>
</frame>
var objValue=window.parent.frames["down"].document.getElementById("456");
alert(objValue.value);