04tree鼠标移入出现增删改上下移操作

完整组件，作为路由可以直接看到效果：

<template>
  <div class="box">
    <div class="exam_structure">
      <!-- <el-input v-model="filterText" placeholder="输入关键字进行过滤"> </el-input>
      <el-button type="primary" size="small" class="add_new_question" @click="add_new_question">添加</el-button> -->
    </div>

    <div class="question_info_lists">
      <el-tree
        ref="tree"
        :key="tree_key"
        :data="treeData"
        node-key="id"
        :render-content="renderContent"
        :expand-on-click-node="false"
        :default-expanded-keys="defaultExpand"
        :filter-node-method="filterNode"
      ></el-tree>

      <el-row v-show="add_question_flag" class="add_question">
        <el-col :span="12">
          <el-input v-model="new_question_name" placeholder="请输入大题名称"></el-input>
        </el-col>
        <el-col :span="12">
          <el-button size="mini" class="btn_sure" @click.stop="add_question_sure">确定</el-button>
          <el-button size="mini" class="btn_cancel" @click.stop="add_question_cancel">取消</el-button>
        </el-col>
      </el-row>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Tree1',
  data() {
    return {
      filterText: '',
      treeData: [
        {
          id: 1,
          label: '一级 1',
          isEdit: false,
          children: [
            {
              id: 4,
              label: '二级 1-1',
              isEdit: false,
              children: [
                { id: 9, label: '三级 1-1-1', isEdit: false, children: [] },
                {
                  id: 10,
                  label: '三级 1-1-2',
                  isEdit: false,
                  children: []
                },
                {
                  id: 11,
                  label: '三级 1-1-3',
                  isEdit: false,
                  children: []
                }
              ]
            },
            {
              id: 12,
              label: '二级 1-2',
              isEdit: false,
              children: []
            },
            {
              id: 13,
              label: '二级 1-3',
              isEdit: false,
              children: []
            }
          ]
        },
        {
          id: 2,
          label: '一级 2',
          isEdit: false,
          children: [
            { id: 5, label: '二级 2-1', isEdit: false, children: [] },
            {
              id: 6,
              label: '二级 2-2',
              isEdit: false,
              children: []
            }
          ]
        },
        {
          id: 3,
          label: '一级 3',
          isEdit: false,
          children: [
            { id: 7, label: '二级 3-1', isEdit: false, children: [] },
            {
              id: 8,
              label: '二级 3-2',
              isEdit: false,
              children: []
            }
          ]
        }
      ],
      add_question_flag: false,
      new_question_name: '',
      tree_key: 0,
      defaultExpand: []
    }
  },
  watch: {
    filterText(val) {
      this.$refs.tree.filter(val)
    }
  },
  methods: {
    filterNode(value, data) {
      if (!value) return true
      return data.label.indexOf(value) !== -1
    },
    // 添加新大题
    add_new_question() {
      this.add_question_flag = true
    },
    add_question_sure() {
      // 确定
      const nodeObj = { id: '', label: this.new_question_name, isEdit: false, children: [] }
      this.treeData.push(nodeObj)
      this.add_question_flag = false
    },
    add_question_cancel() {
      // 取消
      this.add_question_flag = false
      this.new_question_name = ''
    },
    // 增加
    append(store, node, data) {
      let maxid = '20'
      // 新增数据
      const nodeapp = { id: ++maxid, label: '增加节点', isEdit: false, children: [] }
      data.children.push(nodeapp)
      if (!node.expanded) {
        node.expanded = true
      }
      const parent = node.parent
      const children = parent.data
      const cIndex = children.findIndex(d => d.id === data.id)
      const tempChildrenNodex2 = children[cIndex] // 拿到被添加的上一级
      console.log(tempChildrenNodex2.children[cIndex - 1])
    },
    // 修改
    nodeEdit(ev, store, data) {
      data.isEdit = true
      this.$nextTick(() => {
        const $input =
          ev.target.parentNode.parentNode.querySelector('input') ||
          ev.target.parentElement.parentElement.querySelector('input')
        !$input ? '' : $input.focus()
      })
    },
    edit_sure(ev, data) {
      const $input =
        ev.target.parentNode.parentNode.querySelector('input') ||
        ev.target.parentElement.parentElement.querySelector('input')
      if (!$input) {
        return false
      } else {
        data.label = $input.value
        data.isEdit = false
      }
    },
    // 节点删除
    nodeDelete(node, data) {
      const parent = node.parent
      const children = parent.data.children || parent.data
      const index = children.findIndex(d => d.id === data.id)
      children.splice(index, 1)
    },
    // 节点上移
    nodeUp(node, data) {
      const parent = node.parent
      const children = parent.data.children || parent.data
      const cIndex = children.findIndex(d => d.id === data.id)
      if (parent.level === 0 && cIndex === 0) {
        return
      } else if (parent.level !== 0 && cIndex === 0) {
        // 不同父节点中移动
        alert('不同父节点中移动')
        // const parent2 = parent.parent
        // const children2 = parent2.data.children || parent2.data
        // const pIndex2 = parseInt(children2.findIndex(p => p.id === parent.data.id), 10) - 1
        // if (pIndex2 < 0) return
        // children2[pIndex2].children.push(data)
        // children.splice(cIndex, 1)
        // this.defaultExpand[0] = children2[pIndex2].id
      } else if ((parent.level === 0 && cIndex !== 0) || (parent.level !== 0 && cIndex !== 0)) {
        const tempChildrenNodex1 = children[cIndex - 1]
        const tempChildrenNodex2 = children[cIndex]
        this.$set(children, cIndex - 1, tempChildrenNodex2)
        this.$set(children, cIndex, tempChildrenNodex1)
        this.defaultExpand[0] = data.id
      }
      this.tree_key++
    },
    // 节点下移
    nodeDown(store, node, data) {
      const parent = node.parent
      const children = parent.data.children || parent.data
      const cIndex = children.findIndex(d => d.id === data.id)
      const cLength = children.length - 1 // 最边上的节点
      const allLevel = store.data.length - 1 // 树的深度
      if (parent.level === allLevel && cIndex === cLength) {
        // 最最末的节点
        return
      } else if (parent.level !== allLevel && cIndex === cLength) {
        // 父节点不同
        alert('不能移动')
        // const parent2 = parent.parent
        // const children2 = parent2.data.children || parent2.data
        // const pIndex2 = parseInt((children2.findIndex(p => p.id === parent.data.id)), 10)
        // if (pIndex2 === allLevel) return
        // children2[pIndex2 + 1].children.push(data)
        // children.splice(cIndex, 1)
        // this.defaultExpand[0] = children2[pIndex2 + 1].id
      } else if (
        (parent.level === allLevel && cIndex !== cLength) ||
        (parent.level !== allLevel && cIndex !== cLength)
      ) {
        // 父节点相同
        const tempChildrenNodex1 = children[cIndex + 1]
        const tempChildrenNodex2 = children[cIndex]
        this.$set(children, cIndex + 1, tempChildrenNodex2)
        this.$set(children, cIndex, tempChildrenNodex1)
        this.defaultExpand[0] = data.id
      }
      this.tree_key++
    },
    showOrEdit(data) {
      if (data.isEdit) {
        return <input type="text" value={data.label} on-blur={ev => this.edit_sure(ev, data)} />
      } else {
        return <span className="node_labe">{data.label}</span>
      }
    },
    // 结构树操作group node,
    renderContent(h, { node, data, store }) {
      //   console.log(node, '~~@#$$%', data, '88888888', store)
      return (
        <div
          class="custom-tree-node"
          on-mouseover={() => {
            this.$set(data, 'isShow', true)
          }}
          on-mouseout={() => {
            data.isShow = false
          }}
        >
          <span>{this.showOrEdit(data)}</span>
          <div v-show={data.isShow} class="tree_node_op" style="float: right;">
            <i class="el-icon-edit" on-click={ev => this.nodeEdit(ev, store, data)}></i>
            <i class="el-icon-delete" on-click={() => this.nodeDelete(node, data)}></i>
            <i class="el-icon-upload2" on-click={() => this.nodeUp(node, data)}></i>
            <i class="el-icon-download" on-click={() => this.nodeDown(store, node, data)}></i>
            <i class="el-icon-plus" on-click={() => this.append(store, node, data)}></i>
          </div>
        </div>
      )
    }
  }
}
</script>
<style lang="scss" scoped>
.box {
  margin: 30px;
}
</style>