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mouseenter([[data],fn])
概述
当鼠标指针穿过元素时，会发生 mouseenter 事件。该事件大多数时候会与mouseleave 事件一起使用。
与 mouseover 事件不同，只有在鼠标指针穿过被选元素时，才会触发 mouseenter 事件。如果鼠标指针穿过任何子元素，同样会触发 mouseover 事件。
参数
fnFunctionV1.0
在每一个匹配元素的mouseenter事件中绑定的处理函数。
[data],fnString,FunctionV1.4.3
data:mouseenter([Data], fn) 可传入data供函数fn处理。
fn:在每一个匹配元素的mouseenter事件中绑定的处理函数。
示例
描述:
当鼠标指针进入（穿过）元素时，改变元素的背景色：
jQuery 代码:
$("p").mouseenter(function(){
$("p").css("background-color","yellow");
});