top.location.href,parent.location.href和self.location.href有什么不同？

window.location.href="url" self.location.href="url" this.location.href="url" location.href="url"                    这四个跳转效果相同，表水仅在本页打开url地址 top.location.href="url"              在最外层，也就是顶层打开url地址（跳出ifr

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