js 动态修改：：before ：：after 伪元素样式

最新推荐文章于 2024-04-22 17:40:03 发布

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博客主要围绕使用JS动态修改::before和::after伪元素样式展开，聚焦于前端开发中利用JavaScript对特定伪元素样式进行动态调整的相关内容。

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<div class="showInfo" ref="showInfo" id="showInfo"></div>

<style>
    #showInfo {
        position: absolute;
        background-color: #fff;
        border: 1px solid rgba(0, 0, 0, 0.36);
        opacity: 0.9;
        width: 100;
        height: 86px
    }

    #showInfo:before {
        content: "";
        position: absolute;
        width: 0;
        height: 0;
        left: 50%;
        top: -13px;
        margin-left: -10px;
        border-top: 0;
        border-left: 10px solid transparent;
        border-right: 10px solid transparent;
        border-bottom: 13px solid rgba(0, 0, 0, 0.36);
    }

    #showInfo:after {
        content: "";
        position: absolute;
        width: 0;
        height: 0;
        left: 50%;
        top: -11.5px;
        border-top: 0;
        margin-left: -10px;
        border-left: 10px solid transparent;
        border-right: 10px solid transparent;
        border-bottom: 12.5px solid white;
    }

    /* #showInfo:before {
        content: "";
        position: absolute;
        width: 0;
        height: 0;
        left: 50%;
        top: 100%;
        margin-left: -10px;
        border-left: 10px solid transparent;
        border-right: 10px solid transparent;
        border-bottom: 0;
        border-top: 13px solid #000;
    }

    #showInfo:after {
        content: "";
        position: absolute;
        width: 0;
        height: 0;
        left: 50%;
        top: 100%;
        margin-left: -10px;
        border-left: 10px solid transparent;
        border-right: 10px solid transparent;
        border-bottom: 0;
        border-top: 13px solid white;
    } */
</style>
<script>
    // document.styleSheets[0].addRule('#showInfo::after', 'top:86px;border-top:12.5px solid white;border-bottom:0');
    // document.styleSheets[0].addRule('#showInfo::before', 'top:86px;border-top:13px solid #000;border-bottom:0');
</script>