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                            ### 代碼：
~~~
 <style>
    *{margin: 0;padding: 0}
    li{
        position: relative;
        width: 100px;
        height: 50px;
        list-style: none;
        text-align: center;
        line-height: 50px;
    }
    #hide{  
        position: relative;
        margin-left: 34px;
        border: 1px solid #333;
        width: 80px;
        text-align: center;
    }
    #hide a{
        line-height: 25px;
        display: block;
    }
    li::after{
        content: "";
        border: 5px solid transparent;
        border-top-color: #000;
        position: absolute;
        top: 23px;
        left: 77px;
    }
    #hide::after{
        content: "";
        border: 5px solid transparent;
        border-bottom-color: rgb(179, 175, 175);
        position: absolute;
        top: -11px;
        left: 40px;
    }
    .none{
        display: none;
    }
    </style>
</head>
<body>
    <ul>
        <li id="li">設置</li>
        <div class="none" id="hide">
            <a href="">搜索設置</a>
            <a href="">搜索設置</a>
            <a href="">搜索設置</a>
            <a href="">搜索設置</a>
        </div>
    </ul>
    <script>
            var li =document.getElementById("li");
            var hide=document.getElementById("hide");
            li.onclick =()=>{
                console.log(1);
                // if(parent.className =="none"){
                //     parent.className ="show"
                // }else{
                //     parent.className ="none" 
                // }
                 hide.classList.toggle("none");
            }
            </script>
</body>
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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