左侧导航菜单子菜单的显示隐藏效果

╰半夏微凉° 2022-06-12 10:36 246阅读 0赞

直接上代码，逻辑都在注释里

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <title>弹出菜单</title>
    	
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="this is my page">
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">
        
    	<script type="text/javascript" src="js/jquery-1.2.6.js"></script>
      <link rel="stylesheet" type="text/css" href="css/menu.css">
    	<script type="text/javascript">
    		$(document).ready(function(){
    			//默认让第一个显示
    			$("#frist>li").css("display","block");
    			$("#frist>img").attr("src","img/arrow2.png");
    		//找到所有的主菜单
    		//给所有主菜单注册点击事件
    		//找出ul中的所有节点
    			var as = $("ul>a");
    			as.click(function(){
    				//找到当前ul中的li,然后让li显示出来
    				//获取当前被点击a节点
    				var aNode = $(this);
    			var va=aNode.next("img").attr("src");
    			
    			if (va=="img/arrow2.png") {
    				aNode.next("img").attr("src","img/arrow.png")
    			}else if (va=="img/arrow.png") {
    				aNode.next("img").attr("src","img/arrow2.png")
    			}
    				// aNode.next("img").attr("src","img/arrow2.png")
    
    				//找到当前a节点的所有li兄弟字节点
    				var lis = aNode.nextAll("li");
    				//让子节点显示或隐藏
    				lis.toggle("show");
    			});
    
    			//打开三级页面
    			$("li>a").click(function(){
    				$("#content").load($(this).attr("id"));
    			});
    		});
    	</script>
    	
      </head>
      
      <body style="background:#924CC6">
        <ul id="frist">
        	<a href="#">菜单1</a><img class="img1" src="img/arrow.png">
        	<li><a href="#" id="1.html">子菜单1</a></li>
        	<li><a href="#" id="2.html">子菜单2</a></li>
        </ul>
        <ul>
        	<a href="#">菜单2</a><img class="img1" src="img/arrow.png">
        	<li ><a href="#" id="2.html">子菜单3</a></li>
        	<li ><a href="#" id="1.html">子菜单4</a></li>
        </ul>
        <div id="content"></div>
      </body>
    </html>