1.為什么使用vue-validator總是報錯，在main.js中這樣引入： import VueValidator from 'vue-validator'  Vue.use(VueValidator)在logoin.vue組件中這樣寫的：  <validator name="validation">           <form novalidate >             <p>                 <span class="phone"></span>                 <input name="phone" type="text"                 id="username"                 v-model="message.userLoginName"                 placeholder="請輸入賬號"                 v-validate:username="['required']">                 <span                 v-if="$validation.username.required">                   請輸入9-20位賬號                </span>             </p>