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如何为以前的 flickity 幻灯片添加一个类？我需要他们淡出。我正在使用安装了 npm 的 Vue.js 轻弹。当前幻灯片有.is-selected类，所以也许我可以以某种方式.is-prev, .is-next动态添加类？
.is-selected
.is-prev, .is-next