jQuery之mouseover与mouseenter区别

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>19_事件切换</title>
</head>
<style type="text/css">
    * {
        margin: 0px;
    }
    .div1 {
        position: absolute;
        width: 200px;
        height: 200px;
        top: 50px;
        left: 10px;
        background: olive;
    }
    .div2 {
        position: absolute;
        width: 100px;
        height: 100px;
        top: 50px;
        background: red;
    }
    .div3 {
        position: absolute;
        width: 200px;
        height: 200px;
        top: 50px;
        left: 230px;
        background: olive;
    }
    .div4 {
        position: absolute;
        width: 100px;
        height: 100px;
        top: 50px;
        background: yellow;
    }

    .divText{
        position: absolute;
        top: 330px;
        left: 10px;
    }

</style>
<body>

<div class="divText">
    区分鼠标的事件
</div>

<div class="div1">
    div1.....
    <div class="div2">div2....</div>
</div>

<div class="div3">
    div3.....
    <div class="div4">div4....</div>
</div>
<!--
区别mouseover与mouseenter?
    * mouseover: 在移入子元素时也会触发, 对应mouseout
    * mouseenter: 只在移入当前元素时才触发, 对应mouseleave
                                hover()使用的就是mouseenter()和mouseleave()
区别on('eventName', fun)与eventName(fun)
    * on('eventName', fun): 通用, 但编码麻烦
    * eventName(fun): 编码简单, 但有的事件没有对应的方法
-->
<script src="js/jquery-1.10.1.js" type="text/javascript"></script>
<script type="text/javascript">
    $('.div1')
        .mouseover(function () {
            console.log('mouseover 进入')
        })
        .mouseout(function () {
            console.log('mouseout 离开')
        })

//下面这种，鼠标在div3与div4之间切换的时候是不会触发的
    $('.div3')
        .mouseenter(function () {
            console.log('mouseenter 进入')
        })
        .mouseleave(function () {
            console.log('mouseleave 离开')
        })

</script>
</body>
</html>