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                            ## 隔行變色和高亮顯示
```
<body>
<ul id="ul">
    <li>哈哈哈哈</li>
    <li>哈哈哈哈</li>
    <li>哈哈哈哈</li>
    <li>哈哈哈哈</li>
    <li>哈哈哈哈</li>
</ul>

<input type="button" value="改變" id="btn">


<script>
    var ul = document.getElementById('ul');
    var lis = ul.getElementsByTagName('li');
    for (let i = 0; i < lis.length; i++) {

        if (i % 2 != 0) {
            lis[i].style.backgroundColor = 'pink';
        } else {
            lis[i].style.backgroundColor = 'skyblue';
        }
    }

    for (let i = 0; i < lis.length; i++) {
        var color;
        lis[i].onmouseover = function () {
            color = this.style.backgroundColor;
            this.style.backgroundColor = 'black';
        }

        lis[i].onmouseout = function () {
            this.style.backgroundColor = color;
        }
    }
</script>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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