### 返回值:jQuerykeypress([[data],fn])
### 概述
當鍵盤或按鈕被按下時，發生 keypress 事件。
keypress 事件與 keydown 事件類似。當按鈕被按下時，會發生該事件。它發生在當前獲得焦點的元素上。 不過，與 keydown 事件不同，每插入一個字符，就會發生 keypress 事件。注釋：如果在文檔元素上進行設置，則無論元素是否獲得焦點，該事件都會發生。
### 參數
#### **fn**Function*V1.0*
在每一個匹配元素的keypress事件中綁定的處理函數。
#### **[data],fn**String,Function*V1.4.3*
**data**:keypress([Data], fn) 可傳入data供函數fn處理。
**fn**:在每一個匹配元素的keypress事件中綁定的處理函數。
### 示例
#### 描述:
計算在輸入域中的按鍵次數：
##### jQuery 代碼:
~~~
$("input").keydown(function(){ $("span").text(i+=1);});
~~~
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