如果检查类存在js
代码示例
javascript检查，如果元素都有类
if(document.getElementById("myElmentID").classList.contains("hidden")){
// I have the 'hidden' class
}如果检查一类的存在javascript
const element = document.querySelector("#box");
element.classList.contains("active");类似页面
带有示例的类似页面
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