关闭窗口，这个事件怎么怎么触发不了，ctrl+w<!DOCTYPE html><html><head> <meta charset="UTF-8" /> <title>Document</title></head><body ><p>Close the page to trigger the onunload event.</p><script> window.onunload= function(){ alert('The onunload event was triggered') }</script></body></html>
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