js添加删除class

添加: obj.classList.add("active");

删除:obj.classList.remove("active");
例子

<button class="btn1 btn2">点击</button>
        
<script>
            var btn=document.querySelector(".btn1");
            btn.onclick=function(){
                this.classList.remove("btn2")
            }
</script>

 

添加: obj.classList.add("active");

删除:obj.classList.remove("active");
例子

<button class="btn1 btn2">点击</button>
        
<script>
            var btn=document.querySelector(".btn1");
            btn.onclick=function(){
                this.classList.remove("btn2")
            }
</script>