alert(opener.name)为何没有结果？

教材上说：alert(opener.name)可以获得父窗口的名字。

cat father.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <script>
    window.open('file:///tmp/child.html');
    </script>
</body>
<p>i am father window</p>
</html>

cat child.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script>
        alert(opener.name);
    </script>
</head>
<body>
    <p>i am child window</p>
</body>
</html>

浏览器中输入 file:///tmp/father.html ，child.html也会打开，但是为何没有alert窗口打开？

javascript

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3 个回答

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