<van-dialog
   v-model="showDialog"
   title="提示"
   show-cancel-button
   :before-close="onBeforeClose"
   @confirm="handleConfirm"
  >
   <van-form ref="myform">
    <van-field
     v-model="attendanceName"
     name="name"
     label="名称"
     placeholder="请输入名称"
     :rules="[
      { required: true, message: '请填写名称' }
     ]"
    />
   </van-form>
  </van-dialog>

  onBeforeClose(action, done) {
   if (action === "confirm") {
    return done(false);
   } else {
    // 重置表单校验
    this.$refs["myform"].resetValidation("name");
    this.name= undefined;
    return done();
   }
  },

  // 实例弹窗确认
  handleConfirm() {
   this.$refs["myform"]
    .validate()
    .then(() => {
     let para = {
      data: {
       name: this.name,
      },
     };
     ajaxAdd(para).then(() => {
      this.showDialog = false; // 在这里手动的关闭弹窗
      this.$toast.success("新增成功");
      this.name= undefined;
      this.onRefresh();
     });
    })
    .catch(() => {});
  },