index.html---------------------------------------------------------------
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>window.open</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
</head>
<body>
<button );
// 定义全局变量给open页面调用
window.getTitleFun = setOpenTile
})
})
</script>
open.html---------------------------------------------------------------
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>openTitle</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
</head>
<body>
<button type="button" >确定</button>
</body>
</html>
<script type="text/javascript">
window.onload=function(){
if (window.opener != null) {
document.title = window.opener.getTitleFun;
}
}
</script>