vue.js如何在标签属性中插入变量参数

    <ul class="menu" v-for="(item,index) in 4">
                            <li :class="{'selected':index===clickIndex}" @click="selected(index)">
                                <div>
                                    <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="'img/'+(item+nameIndex)+'.jpg'" />
                                    <a href="#"></a>
                                </div>
                            </li>
       </ul>