element中vpopover使用的小例子

应用自定义指令v-popover指向 Popover 的索引ref的例子：

`

    <el-form-item label="链接:" prop="dbUrl">      <el-input        v-model="dataSourceDetail.dbUrl"        v-popover:popover1        placeholder="请输出链接"      >      </el-input>      <el-popover        ref="popover1"        placement="bottom"        width="450"        trigger="hover"        :content="dbUrlTip"      >      </el-popover>    </el-form-item>    <el-form-item label="驱动类名:" v-popover:popover2 prop="driverClass">      <el-input        v-model="dataSourceDetail.driverClass"        placeholder="请输出驱动类名"      >      </el-input>      <el-popover        ref="popover2"        placement="bottom"        width="450"        trigger="hover"        :content="driverClassTip"      >      </el-popover>

`