element-plus/packages/tree/doc/basic7.vue

<template>
  <div class="custom-tree-container">
    <div class="block">
      <p>使用 render-content</p>
      <el-tree
        :data="data"
        show-checkbox
        node-key="id"
        default-expand-all
        :expand-on-click-node="false"
        :render-content="renderContent"
      />
    </div>
    <div class="block">
      <p>使用 scoped slot</p>
      <el-tree
        :data="data"
        show-checkbox
        node-key="id"
        default-expand-all
        :expand-on-click-node="false"
      >
        <template #default="{ node, data: innerData }">
          <span class="custom-tree-node">
            <span>{{ node.label }}</span>
            <span>
              <el-button
                type="text"
                size="mini"
                @click="append(innerData)"
              >
                Append
              </el-button>
              <el-button
                type="text"
                size="mini"
                @click="remove(node, innerData)"
              >
                Delete
              </el-button>
            </span>
          </span>
        </template>
      </el-tree>
    </div>
  </div>
</template>
<script>
let id = 1000

export default {
  data() {
    const data = [{
      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',
      }],
    }]
    return {
      data: JSON.parse(JSON.stringify(data)),
    }
  },

  methods: {
    append(data) {
      const newChild = { id: id++, label: 'testtest', children: [] }
      if (!data.children) {
        data.children = []
      }
      data.children.push(newChild)
      this.data = [...this.data]
    },

    remove(node, data) {
      const parent = node.parent
      const children = parent.data.children || parent.data
      const index = children.findIndex(d => d.id === data.id)
      children.splice(index, 1)
      this.data = [...this.data]
    },

    renderContent(h) {
      return h('div', { class: 'custom-tree-node' }, ['haha'])
    },
  },
}
</script>

<style>
.custom-tree-node {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    padding-right: 8px;
}
</style>