一、TableTreeLevel组件
<template>
<div class='main'>
<div class="btns">
<el-button type="primary" @click="expandLevel(1)">展开一级</el-button>
<el-button type="primary" @click="expandLevel(2)">展开二级</el-button>
<el-button type="primary" @click="expandLevel(3)">展开三级</el-button>
<el-button type="primary" @click="expandLevel(4)">展开四级</el-button>
<el-button type="warning" @click="putAwayLevel(0)">全部收起</el-button>
</div>
<div>
<el-table ref="multipleTableRef" :height="height" :default-expand-all=文章来源地址https://www.toymoban.com/news/detail-612048.html
文章来源：https://www.toymoban.com/news/detail-612048.html
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