.vue

<van-tabbar-item @click="dialPhoneNumber(Telephone)">
        <span>打电话</span>
</van-tabbar-item>

.ts

private dialPhoneNumber(phoneNumber) {
    if (!phoneNumber) {
      this.$toast({
        message: "此用户未配置电话信息,请联系管理员",
        position: "bottom",
        duration: 2000
      });
      return;
    }
    window.location.href = "tel:" + phoneNumber;
  }