jq 获取操作子元素失败？

Question

Title112233112222333344112233223344334455点击$(function(){$("#btn").click(function(){console.log($("#ulsli")[1]);$("#ulsli")[1].children().children(".db1").css({"color":"red"});for(vari=0;i

Answer 1

$("#btn").click(function(){
$("#ulsli").each(function(){
if($(this).find(".db1").css("display")=='none'){
$(this).css("display","none");
}
});
});
                            

Answer 2

console.log($("#ulsli")[1].children[0].children[1]);
$("#ulsli")[1].children[0].children[1].style.color="red";