element下拉菜单获取不到值

element下拉菜单写了点击事件后获取不到表格的值是为什么？

下拉菜单不是用click事件

<el-dropdown @command="handleCommand">
  <span class="el-dropdown-link">
    下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
  </span>
  <el-dropdown-menu slot="dropdown">
    <el-dropdown-item command="a">黄金糕</el-dropdown-item>
    <el-dropdown-item command="b">狮子头</el-dropdown-item>
    <el-dropdown-item command="c">螺蛳粉</el-dropdown-item>
    <el-dropdown-item command="d" disabled>双皮奶</el-dropdown-item>
    <el-dropdown-item command="e" divided>蚵仔煎</el-dropdown-item>
  </el-dropdown-menu>
</el-dropdown>

<style>
  .el-dropdown-link {
    cursor: pointer;
    color: #409EFF;
  }
  .el-icon-arrow-down {
    font-size: 12px;
  }
</style>

<script>
  export default {
    methods: {
      handleCommand(command) {
        this.$message('click on item ' + command);
      }
    }
  }
</script>

监听item的click事件肯定不好用的啦，官网文档有特定的方法仔细看看

这种情况官方文档都有介绍，仔细看例子，然后看例子用到的api参数方式..