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                            ### 代碼：
~~~
<style>
       *{margin: 0;padding: 0} 
    ul{
        font-size: 0;
       background: #5f5f5f;
    }
    li{
        text-align: center;
        line-height: 50px;
        font-size: 16px;
        list-style: none;
        display: inline-block;
        width: 100px;
        height: 50px;
        color: #fff;
    }
    .current{
        background:#4caf50 ;
    }
    li:hover{
        background: #000;
    }
    </style>
</head>
<body>
   <ul>
       <li class="current">html</li>
       <li>css</li>
       <li>javascript</li>
   </ul>
   <script>
   window.onload=function(){
       var lis =document.getElementsByTagName("li");
       for(let i=0;i<lis.length;i++){
           lis[i].onclick=function(){
               
        for(let i=0;i<lis.length;i++){
           lis[i].style.backgroundColor="#5f5f5f"
       }
       this.style.backgroundColor="#4caf50"
   }
       }
   }
   </script> 
</body>
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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