### 返回值:jQueryunload([[data],fn])
### 概述
在當用戶離開頁面時，會發生 unload 事件。
具體來說，當發生以下情況時，會發出 unload 事件：
- 點擊某個離開頁面的鏈接
- 在地址欄中鍵入了新的 URL
- 使用前進或后退按鈕
- 關閉瀏覽器
- 重新加載頁面
### 參數
#### **fn**Function*V1.0*
在每一個匹配元素的unload事件中綁定的處理函數。
#### **[data],fn**String,Function*V1.4.3*
**data**:unload([Data], fn) 可傳入data供函數fn處理。
**fn**:在每一個匹配元素的unload事件中綁定的處理函數。
### 示例
#### 描述:
頁面卸載的時候彈出一個警告框:
##### jQuery 代碼:
~~~
$(window).unload( function () { alert("Bye now!"); } );
~~~
- 速查表
- 核心
- jQuery(selector,[context])
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- 效果
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- 關于
- 關于jQuery API 文檔
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- 其它
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- 正則表達式在線測試
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