### 返回值:jQuerykeypress([[data],fn])
### 概述
触发每一个匹配元素的keypress事件
T这个函数会调用执行绑定到keydown事件的所有函数，包括浏览器的默认行为。可以通过在某个绑定的函数中返回false来防止触发浏览器的默认行为。keydown事件会在键盘按下时触发
### 参数
#### **fn**Function*V1.0*
在每一个匹配元素的keypress事件中绑定的处理函数。
#### **[data],fn**String,Function*V1.4.3*
**data**:keypress([Data], fn) 可传入data供函数fn处理。
**fn**:在每一个匹配元素的keypress事件中绑定的处理函数。
### 示例
#### 描述:
计算在输入域中的按键次数：
##### jQuery 代码:
~~~
$("input").keydown(function(){ $("span").text(i+=1);});
~~~
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