title: Vue :page don't display after add router-link
body: <p>I have this template :</p>
  <pre><code>&lt;template&gt;
      &lt;div&gt;
          &lt;div v-for=&quot;course in courses&quot; :key=&quot;course.id&quot;&gt;
              &lt;router-link&gt;{{course.body_ku}}&lt;/router-link&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/template&gt;
  
  &lt;script&gt;
  import {myUrl} from '../components/Constants'
  export default {
      data:function(){
          return{
              courses :[]
          }
      },
      created:function(){
          const url = myUrl + 'category_post/2'
          this.axios.get(url).then((response)=&gt;{
              this.courses = response.data
          })
      }
  }
  &lt;/script&gt;
  </code></pre>
  <p>it is not display anything ,but when I remove router-link it works correctly</p>