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                            ```
<body>

<div id="menu">
    <ul id="list">
        <li class="current"><a href="javascript:void(0)">首頁</a></li>
        <li><a href="javascript:void(0)">播客</a></li>
        <li><a href="javascript:void(0)">博客</a></li>
        <li><a href="javascript:void(0)">相冊</a></li>
        <li><a href="javascript:void(0)">關于</a></li>
        <li><a href="javascript:void(0)">幫助</a></li>
    </ul>
</div>

<script>
    //javascript是協議,瀏覽器的地址欄也是可以執行javascript的,void()可以執行一個表達式,返回undefined

    var menu = document.getElementById('menu');
    var ul = menu.firstElementChild;
    for (let i = 0; i < ul.children.length; i++) {
        var li = ul.children[i];
        //獲取li中的a標簽
        var link = li.firstElementChild;
        link.onclick = fn;
    }

    function fn() {
        for (let i = 0; i < ul.children.length; i++) {
            var li = ul.children[i];
            li.className = '';
        }
        //this就是當前的a標簽的元素
        this.parentNode.className = 'current';
        return false;
    }
</script>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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