效果：

html:

<div class="task_order">
     <div class="text">排序：</div>
     <div class="item">任务类型 
         <div class="tri_box">
             <div class="tri_up"></div>
             <div class="tri_down "></div>
         </div>
     </div>
     <div class="item">任务金额
         <div class="tri_box">
             <div class="tri_up"></div>
             <div class="tri_down" style="border-color: #bbb transparent transparent transparent;"></div>
         </div>
     </div>
     <div class="item">剩余时间
         <div class="tri_box">
             <div class="tri_up"></div>
             <div class="tri_down" style="border-color: #bbb transparent transparent transparent;"></div>
         </div>
     </div>
</div>

css:

 .task_order{
        display: flex;
        margin-top: 20px;
        align-items: center;
    }
    .task_order .item{
        position: relative;
        display: flex;
        align-items: center;
        margin-right: 3rem;
    }
    .task_order .tri_box{
        margin-left: 5px;
    }
    .task_order .tri_up{
        width: 0;height: 0;overflow: hidden;border-width: 4.5px;border-color:transparent  transparent #bbb transparent;border-style: solid dashed;
        margin-bottom: 2px;
        cursor: pointer;
    }
    .task_order .tri_down{
        width: 0;height: 0;overflow: hidden;border-width: 4.5px;border-color: #ff6a2f transparent transparent transparent;border-style: solid dashed;
        margin-top: 2px;
        cursor: pointer;
    }

jq：

 <script>
        $(".tri_up").click(function(){
            $(this).css('border-color','transparent  transparent #ff6a2f transparent');
            $(this).parent().children('.tri_down').css('border-color','#bbb transparent transparent transparent');
        });

        $(".tri_down").click(function(){
            $(this).parent().children('.tri_up').css('border-color','transparent  transparent #bbb transparent');
            $(this).css('border-color','#ff6a2f transparent transparent transparent');
        });
    </script>