js子窗口传值回父窗口window.open方式

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<html>
<head>
<title>父窗口</title>
<script language="javascript">
function look(){
window.open("b.html");
}

</script>
</head>
<body>
<input type="button" value="查看商品列表" /></br>
<div style="display:none"><span>你选择的商品是:</span><span ></span></div>
</body>
</html>

子窗口 b.html

<html>
<head>
<title></title>
</head>
<body>
<select >
<option value="0">请选择商品</option>
<option value="笔记本">笔记本</option>
<option value="手机">手机</option>
<option value="数码相机">数码相机</option>
</select>  
</body>
</html>
<script language="javascript">
function look(obj){
window.opener.document.getElementById("mybutton").value="重新选择";
window.opener.document.getElementById("mydiv").style.display="block";
window.opener.document.getElementById("myspan").innerText=obj.value;   
window.close();

</script>