全选和取消全选

var allselect = document.querySelector("#checkAllTop")
      var singleselect = document.getElementsByClassName("cameraCheckBoxTop")
      allselect.addEventListener("click",function () {
        for(let i = 0; i<singleselect.length; i++){
          console.log(singleselect.length)
          singleselect[i].checked = this.checked
        }
      })
      setTimeout(()=>{
        for(var i=0; i<singleselect.length; i++){
          singleselect[i].addEventListener("click",function(){
            var flag = true
            for(var i=0; i<singleselect.length; i++){
              if(!singleselect[i].checked)
              flag = false
            }
            allselect.checked = flag
          })
        }
      },1000)