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关于浏览器关闭操作js代码执行情况？

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关于浏览器关闭操作js代码执行情况？

点击x关闭浏览器，浏览器是否会等待js同步代码执行完成，然后再关闭？

如果不等待同步代码执行完成

  1. 那么浏览器是如何处理未执行完的代码？
  2. 那么onbeforeunload事件岂不是没多大意义？

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