Vue开发实例实现左侧菜单导航

<template>
  <div class="side-nav">
    <el-menu
      default-active="2"
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose"
      unique-opened
    >
      <el-submenu index="1">
        <template slot="title">
          <i class="el-icon-location"></i>
          <span>导航一</span>
        </template>
        <el-menu-item index="1-1">选项1</el-menu-item>
        <el-menu-item index="1-2">选项2</el-menu-item>
      </el-submenu>
      <el-menu-item index="2">
        <i class="el-icon-menu"></i>
        <span slot="title">导航二</span>
      </el-menu-item>
      <el-menu-item index="3" disabled>
        <i class="el-icon-document"></i>
        <span slot="title">导航三</span>
      </el-menu-item>
      <el-menu-item index="4">
        <i class="el-icon-setting"></i>
        <span slot="title">导航四</span>
      </el-menu-item>
    </el-menu>
  </div>
</template>
 
<script>
export default {
  methods: {
    handleOpen(key, keyPath) {
      console.log('菜单项打开', key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log('菜单项关闭', key, keyPath);
    }
  }
}
</script>
 
<style>
.side-nav {
  height: 100%;
}
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
</style>

这个代码实例使用了Element UI库中的<el-menu>和<el-submenu>组件来创建一个左侧的导航菜单。菜单项可以被打开和关闭，并且提供了两个方法handleOpen和handleClose来处理这些事件。这个例子展示了如何使用Vue和Element UI来构建一个功能完整的左侧菜单导航。