vue.js怎么在标签属性中插入变量参数

 <ul class="menu" v-for="(item,index) in 4">
              <li :class="{&#39;selected&#39;:index===clickIndex}" @click="selected(index)">
                <p>
                  <h3>{{item}}点位标签</h3>
                  <span style="margin: 15px 0px;">附近的资产:3个(2个未完成修订)</span><br />
                  <img :src="&#39;img/&#39;+(item+nameIndex)+&#39;.jpg&#39;" />
                  <a href="#" rel="external nofollow" ></a>
                </p>
              </li>
    </ul>