window.top.location的作用_html/css_WEB-ITnose
top, 表示是顶层页面， 因为页面之中可能嵌入了 frame 等子页面，top表示最外面一层
Html代码
<html> <head> <script type="text/javascript"> function breakout() { if (window.top!=window.self) { window.top.location="/example/hdom/tryjs_breakout.htm" } } </script> </head> <body> <input type="button" onclick="breakout()" value="跳出框架！"> </body> </html> 就是你的顶层网页页面的地址对象。 比如现在这个百度知道的页面，它的location.href 就是
http://zhidao.baidu.com/question/88553493.html
而location, 是一个对象，它包括了上面说的那个地址，还有一些方法，
比如replace（替换地址) 等， 和属性 比如 href (地址)
至于top, 表示是顶层页面， 因为页面之中可能嵌入了 frame 等子页面，top表示最外面一层。
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