### 返回值:jQuerymouseenter([[data],fn])
### 概述
當鼠標指針穿過元素時，會發生 mouseenter 事件。該事件大多數時候會與mouseleave 事件一起使用。
與 mouseover 事件不同，只有在鼠標指針穿過被選元素時，才會觸發 mouseenter 事件。如果鼠標指針穿過任何子元素，同樣會觸發 mouseover 事件。
### 參數
#### **fn**Function*V1.0*
在每一個匹配元素的mouseenter事件中綁定的處理函數。
#### **[data],fn**String,Function*V1.4.3*
**data**:mouseenter([Data], fn) 可傳入data供函數fn處理。
**fn**:在每一個匹配元素的mouseenter事件中綁定的處理函數。
### 示例
#### 描述:
當鼠標指針進入（穿過）元素時，改變元素的背景色：
##### jQuery 代碼:
~~~
$("p").mouseenter(function(){
$("p").css("background-color","yellow");
});
~~~
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