<div>

    <span class="chePaiFlag  onIt">普通车牌</span>

    <span class="chePaiFlag">新能源车牌</span>

</div>

$(function () {
           
            $(".chePaiFlag").each(function () {
                var p=$(this);
                p.click(function () {
                   
                   

                    if ($(this).hasClass("onIt"))
                    {
                      
                    }else{
                        $(".chePaiFlag").each(function () {
                            $(this).removeClass("onIt");
                        });
                        $(this).addClass("onIt");
                      
                    }
                    flagPai = p.text();
                    if (flagPai == "新能源车牌") {
                        $(".k8").show();

                    }
                    else {
                        $(".k8").hide();
                    }

                })
            })
        })