設置獲取驗證碼

  <span @click="gainCode()" v-if="showCodeNum">獲取驗證碼</span> <span @click="againGetCode(timerNum)" v-else>從新獲取{{timerNum}}</span></span> data(){ return timerNum: null, //頁面上顯示的倒計時 showCodeNum: t

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