<ul class="sales-menuItem-ul">

            <li class="sales-menuItem-li" v-for="(sub,index) in formdata.data" :key='index' >

              <div>成本{{`${index+1}`}}</div>

              <div class="pur-ret-lime">

                <van-dropdown-menu class="vant-menu" active-color="#1989fa">

                  <van-dropdown-item v-model="sub.value1" :options="option1" />

                </van-dropdown-menu>

                <div class="pur-ret-icon"><img src="../../assets/images/icon_more_g.png" alt=""></div>

              </div>

              <div class="sales-flex flex-betweenCenter"><van-field v-model="sub.number1" type="number" />元/本</div>

            </li>

          </ul>

          <div class="sales-menuItem-addBox"><span class="sales-menuItem-add gr_color" @click="addTags">+添加销售价格明细</span></div>

return {

      formdata:{

        data:[

          {

            value1: 0,

            number1: 0.5,

          }

        ]

      },

      option1:[

        { text: '材料成本', value: 0 },

        { text: '材料成本2', value: 1 },

        { text: '材料成本3', value: 2 },

      ],

}

methods:{

    addTags(){

      var that = this

      const obj = {

        value1: 0,

        number1: '',

      };

      that.formdata.data.push(obj);

    },

}