jquery实现鼠标经过事件两种方法

方法一: 用 mouseenter() 和 mouseleave() 实现

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style type="text/css">
            #test {width: 100px; height: 100px;}
        </style>
    </head>
    <body>
        <div id="test">123132</div>
    </body>
</html>
<script src="jquery-3.4.1.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
    $(function() {
        $(\'#test\').mouseenter(function() {
            $(this).css(\'background\', \'red\');
        });
        $(\'#test\').mouseleave(function() {
            $(this).css(\'background\', \'#fff\');
        }); 
    });
</script>

方法二:用 hover() 实现（推荐使用）

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style type="text/css">
            #test {width: 100px; height: 100px;}
        </style>
    </head>
    <body>
        <div id="test">123132</div>
    </body>
</html>
<script src="jquery-3.4.1.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
    // 语法$(\'selector\').hover(fn1, fn2); fn1鼠标经过时的处理  fn2鼠标离开时的处理
    $(function() {
        $(\'#test\').hover(function(){
            $(this).css(\'background\', \'red\');
        }, function() {
            $(this).css(\'background\', \'#fff\');
        });
    });
</script>