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？
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