popupTest.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>d</title>
</head>
<script type="text/javascript">

    var newWindow;

    function openNewWindow(){
        newWindow = window.open("pop.html", "newWindow", "height=200, width=400, resizable=yes");
    }

    function recieve(){
        var txt = "<font color='red'>자식창에서 받아온 값</font>";
        document.getElementById("process").innerHTML = txt;
        document.myform.receiver.value = newWindow.document.myform.sender.value;
    }
</script>
<body>
    <form name="myform">
    <input type="button" value="자식창 열기" onclick="openNewWindow()"><br>
    부모창 Sender : <input type="text" name="sender" size="10"><br>
    부모창 Receiver : <input type="text" name="receiver" size="10"><span id="process"></span><br/>
    <input type="button" value="받아오기" onclick="recieve()">
</form>
</body>
</html>