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原生JS实现‘点击元素切换背景及字体等’

通过原生JS，实现点击某元素，使得背景颜色和文本样式及颜色的改变。

1、HTML部分

<body>
    <div class="top">
        <span onclick="colChange()" id='span1'>
           <section class="s11">
                <p class="sp111">TOP 6</p>
                <p class="sp112">品牌人气榜</p>
           </section>     
           <section class="s12">
                <div id='t1' class="sd12"></div>
           </section>       
        </span>

        <span onclick="colChange()" id='span2'>
            <section class="s21">
                <p class="sp211">TOP10</p>
                <p class="sp212">高校贡献榜</p>
            </section>     
            <section class="s22">
                <div id='t2' class="sd22"></div>
            </section>
        </span>
    </div>
</body>

2、CSS部分

<style>
        .top{
            display: flex;
            position: absolute;
            left: 50%;
            transform: translateX(-50%); 
        }
        span{
            width: 12.28rem;
            height: 3.57rem;
            border-radius: 75px;
            margin-top: 1.03rem;
        }

        span:first-child{
            margin-left: 0.86rem;
            background: #FEDC53;
        }
        span:last-child{
            margin-left: 0.48rem;
            background: #B80027;
        }
        /* 第一个top */
        .s11, .s21{
            overflow: scroll;
            white-space: nowrap;
            width: 8.72rem;
            height: 3.57rem;
            float: left;
        }

        .sp111, .sp211{
            height: 1.04rem;
            font-family: 'DIN-Bold';
            font-weight: bold;
            color: #C41B28;
            font-size: 1.42rem;
            margin-left: 3.54rem;
        }

        .s12, .s22{
            width: 3.56rem;
            height: 3.57rem;
            float: left;
            position: relative;
        }

        .sd12, .sd22{
            width: 0.95rem;
            height: 0.95rem;
            background-image: url('../images/section/top1.png');
            background-size: 100% 100%;
            margin-top: 1.30rem;
            border-radius: 20px; 
            position: absolute;
        } 

        .sd22{
            background-image: url('../images/section/top2.png');
            background-size: 100% 100%;
        }

        /* 第二个TOP颜色整改 */
        .sp211, .sp212{
            color:#FF9BAA;
        }

        .sp22{
            position: relative;
            margin-top: 0.3rem;
            border: 0.47rem solid;
            border-color: #B80027 transparent transparent;
        } 

    </style>

3、Javascript部分

　　主要是利用className进行的样式切换

<script>
    //颜色切换
    let colChange = ()=>{
        let d1 = document.getElementById('t1');
        console.log(d1.className);
        if(d1.className === 'sd12'){
            d1.className = 'sd22';
            let s1 = document.getElementById('span1');
            s1.style.background= '#B80027'; 
            s1.getElementsByTagName('section')[0].children[0].className = 'sp211';
            s1.getElementsByTagName('section')[0].children[1].className = 'sp212';
        }else if(d1.className === 'sd22'){
            d1.className = 'sd12';
            let s1 = document.getElementById('span1');
            s1.style.background= '#FEDC53'; 
            s1.getElementsByTagName('section')[0].children[0].className = 'sp111';
            s1.getElementsByTagName('section')[0].children[1].className = 'sp112';
        }

        let d2 = document.getElementById('t2');
        if(d2.className === 'sd22'){
            d2.className = 'sd12';
            let s1 = document.getElementById('span2');
            s1.style.background= '#FEDC53'; 
            s1.getElementsByTagName('section')[0].children[0].className = 'sp111';
            s1.getElementsByTagName('section')[0].children[1].className = 'sp112';
        }else if(d2.className === 'sd12'){
            d2.className = 'sd22';
            let s1 = document.getElementById('span2');
            s1.style.background= '#B80027'; 
            s1.getElementsByTagName('section')[0].children[0].className = 'sp211';
            s1.getElementsByTagName('section')[0].children[1].className = 'sp212';
        }
    }
</script>

4、效果图如下

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原文地址：https://www.cnblogs.com/zx0423/p/13393609.html