Uncaught DOMException: Blocked a frame with origin "null" from accessing a cross-origin frame.
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代码如下：
<html><head><script>/*window.frames[]可以通过下标或名称访问单独的frame*/window.onload=function(){var h1=window.frames["header"];//.document.getElementsByTagName('h1');alert(h1);}</script></head><frameset rows="80,*"><frame src="top.html" name="header"></frame><frameset cols="180,*"><frame src="menu.html" name="menu"></frame><frame src="main.html" name="main"></frame></frameset></frameset></html>
原因：跨页面操作涉及域的概念（origin），错误的意思是：未捕获的安全错误：阻止了一个域为null的frame页面访问另一个域为null的页面。代码运行时在本地直接用浏览器打开的，地址栏是file:///的页面，只需改为localhost访问就行。
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