<el-menu :default-active="fid"> <el-menu-item v-on:click="openUrl('/write')"> <i class="el-icon-edit"></i> <span slot="title">写信</span> </el-menu-item> <el-menu-item :index="v" v-for="(f,v) in folders" v-bind:key="v" v-on:click="openUrl('/list?fid='+v)"> <i class="el-icon-menu"></i> <span slot="title"><{v}></span> </el-menu-item> </el-menu>