el-tree右键菜单及优化

<template>
    <div id="app">
        <div class="block">
            <el-tree :data="data" node-key="id" default-expand-all :expand-on-click-node="false"
                     @node-contextmenu="rightClick"
            >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span> {{ node.label }}</span>
      </span>
            </el-tree>
        </div>
        <div  id="menu" v-show="menuVisible" @mouseleave="menuVisible=!menuVisible">

            <el-card class="box-card">
                <div class="text item">
                    <el-link icon="el-icon-circle-plus-outline" :underline="false">添加</el-link>
                </div>
                <div class="text item">
                    <el-link icon="el-icon-remove-outline" :underline="false">删除</el-link>  </div>
            </el-card>

        </div>
    </div>
</template>
<script>
    export default {
        data() {
            return {
                nodeData: {},
                menuVisible: false,
                data: [{
                    id: 1,
                    icon: "el-icon-delete",
                    label: '一级 1',
                    children: [{
                        id: 4,
                        label: '二级 1-1',
                        children: [{
                            id: 9,
                            icon: 'el-icon-info',
                            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'
                    }]
                }]
            }
        },

        methods: {
            rightClick(MouseEvent, object, Node, element) {
                this.nodeData = Node
                debugger
                this.menuVisible = true;
                let menu = document.querySelector("#menu");
                menu.style.cssText = "position: fixed; left: " + (MouseEvent.clientX - 10) + 'px' + "; top: " + (MouseEvent.clientY - 25) + 'px; z-index: 999; cursor:pointer;';
            },
            treeAdd() {
                alert(this.nodeData)
            },
            treeRemove() {

                this.menuVisible = true
            }
        }
    }
</script>
<style>

    .text {
        font-size: 14px;
    }

    .item {
        margin-bottom: 18px;
    }

    .clearfix:before,
    .clearfix:after {
        display: table;
        content: "";
    }
    .clearfix:after {
        clear: both
    }

    .box-card {
        width: 100px;
    }

</style>

执行效果