a.html中
winb=window.open("b.html","child"); winb=window.open("b.html","child"
winb=window.open("b.html","child"); winb=window.open("b.html","child"
阅读背景：
用window.open打开过的窗口 如何判断是否已被用户关闭呢？
来源：互联网
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