Uncaught DOMException: Blocked a frame with origin "null" from accessing a cross-origin frame.

代码以下:html <html> <head> <script> /*window.frames[]能够经过下标或名称访问单独的frame*/ window.οnlοad=function(){ var h1=window.frames["header"];//.document.getElementsByTagName('h1'); alert(h1); } </script> </head>
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