一、方法1：
①纵向滚动条容易设置，只需要在el-tree组件中设置height即可
②横向滚动条稍微复杂，如下代码（或者通过js计算）
<template><div class="tree-scroll"><el-input style="width: 180px;margin-top: 10px"placeholder="输入关键字进行过滤"v-model="filterText"></el-input><el-treeclass="flow-tree":data="data2":props="defaultProps"default-expand-all:filter-node-method="filterNode"ref="tree2"></el-tree></div>
</template><script>export default {name: "TreeScroll",watch: {filterText(val) {this.$refs.tree2.filter(val);}},methods: {filterNode(value, data) {if (!value) return true;return data.label.indexOf(value) !== -1;}},data() {return {filterText: '',data2: [{id: 1,label: '一级 1',children: [{id: 4,label: '二级 1-1',children: [{id: 9,label: '三级 1-1-1'}, {id: 10,label: '三级 1-1-2'}]}]}, {id: 2,label: '一级 2',children: [{id: 5,label: '二级 2-1'}, {id: 6,label: '二级 2-2'}]}, {id: 3,label: '一级 3',children: [{id: 7,label: '二级 3-1'}, {id: 8,label: '二级 3-2滚动条滚动条二级 3-2滚动条滚动条'}]}, {id: 4,label: '一级 4',children: [{id: 71,label: '二级 4-1'}, {id: 81,label: '二级 4-2滚动条滚动条二级 3-2滚动条滚动条'}]}, {id: 5,label: '一级 5',children: [{id: 711,label: '二级 5-1'}, {id: 811,label: '二级 5-2滚动条滚动条二级 3-2滚动条滚动条'}]}, {id: 6,label: '一级 6',children: [{id: 7116,label: '二级 5-1'}, {id: 8116,label: '二级 5-2滚动条滚动条二级 3-2滚动条滚动条'}]}],defaultProps: {children: 'children',label: 'label'}};}}
</script><style scoped lang="stylus">.tree-scroll{width 200pxborder 1px solid #E7E7E7height 100%}.flow-tree{overflow autoheight 300pxmargin 10px>>>.el-tree-node{> .el-tree-node__children{overflow visible !important}}}
</style>
)