解決

<mt-navbar v-model='currentTab' @click.active='test'>
  <mt-tab-item id="recharge">充值紀(jì)錄</mt-tab-item>
  <mt-tab-item id="reward">獎(jiǎng)勵(lì)紀(jì)錄</mt-tab-item>
  <mt-tab-item id="payout">消費(fèi)紀(jì)錄</mt-tab-item>
  <mt-tab-item id="payback">獎(jiǎng)勵(lì)紀(jì)錄</mt-tab-item>
</mt-navbar>

new Vue({
data:{
  currentTab: recharge
},
methods: {
  test(){
    console.log(this.currentTab); // 這個(gè)currentTab就是實(shí)時(shí)更新的當(dāng)前tab
  }
}
)}