element UI下拉触发方式

• 导航下拉出发方式

 <el-dropdown @command="handleDashBoard" trigger="click" class="navdash">            <span class="el-dropdown-link" >            <span >面板</span>&nbsp;&nbsp;<i class="el-icon-caret-bottom el-icon--right"></i>                      </span><el-dropdown-menu slot="dropdown"><el-dropdown-item v-for="item in 4" v-text="item" :command="item" :key="item">面板</el-dropdown-item><el-dropdown-item  command="manage" >面板管理</el-dropdown-item></el-dropdown-menu></el-dropdown>`

trigger属性