### 返回值:jQuerykeyup([[data],fn])
### 概述
当按钮被松开时，发生 keyup 事件。它发生在当前获得焦点的元素上。
注释：如果在文档元素上进行设置，则无论元素是否获得焦点，该事件都会发生。
### 参数
#### **fn**Function*V1.0*
在每一个匹配元素的keyup事件中绑定的处理函数。
#### **[data],fn**String,Function*V1.4.3*
**data**:keyup([Data], fn) 可传入data供函数fn处理。
**fn**:在每一个匹配元素的keyup事件中绑定的处理函数。
### 示例
#### 描述:
当按下按键时，改变文本域的颜色：
##### jQuery 代码:
~~~
$("input").keyup(function(){
$("input").css("background-color","#D6D6FF");
});
~~~
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