送至視窗的 close event 的處理器（handler）。（不支援 Firefox 2 及 Safari）
語法
window.onclose = funcRef;
參數
funcRef為函式的參照。
範例
window.onclose = resetThatServerThing;
規範
| 規範 | 狀態 | 備註 |
|---|---|---|
| HTML Living Standard The definition of 'onclose' in that specification. |
Living Standard |
瀏覽器相容性
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| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | (Yes) | ? | ? | ? | No support |
| Feature | Android | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | (Yes) | ? | ? | ? | ? | No support |