创作背景：要做到自定义左右分布的树图，并且添加删除按钮，echarts已经不能满足条件，因此选择antV/g6树图，在此记录

成品展示：

完整代码如下：

1、首先在index.html引入资源

<script src="https://gw.alipayobjects.com/os/lib/antv/g6/4.3.2/dist/g6.min.js">

2、g6Tree.vue组件代码

<template>
  <div>
    <div id="container" :style="{ height: '400px', width: '100%' }" />
  </div>
</template>

<script>

export default {
  data() {
    return {
      graph: undefined,
    };
  },
  props:{
    treedata:{
      type:Object
    }
  },
  watch:{
    "treedata":{
      handler:function(cur,old){
        if(cur != old){
          this.refresh();
        }
      },
      deep:true,	//对象内部的属性监听，也叫深度监听
      // immediate:true
    }
  },
  mounted() {
    this.$nextTick(()=>{
      if(this.treedata.downstreamName){
        this.showChart(this.treedata);
        this.$forceUpdate()
      }
    })
    
  },
  methods: {
    refresh() {
      if (this.graph){
      //销毁方法
      this.graph.destroy();
      }
      //重新实例化
      this.showChart();
      this.$forceUpdate()
    },
    showChart() {
      //为了更明显的展示颜色 配色不好看 别介意哈
      const that = this
      G6.registerNode(
        "tree-node",
        {
          drawShape: function drawShape(cfg, group) {
            const rect = group.addShape("rect", {
              // 节点框样式
              attrs: {
                fill: "blue",//节点框蓝色背景色
                // stroke: "red",
                x: 0,
                y: 0,
                width: 1,
                height: 1,
                radius: [12],
              },
              name: "rect-shape",
            });
            //upriverName代表节点上游，downstreamName代表节点下游（后端的数据就是这样，所以我        这样写）其实不分上下游直接用name也是可以的
            const content = cfg.downstreamName||cfg.upriverName;
            const text = group.addShape("text", {
              // 节点文字样式
              attrs: {
                text: content,
                x: 0,
                y: 0,
                textAlign: "left",
                textBaseline: "middle",
                fill: "white",//节点框内白色文字
              },
              name: "text-shape",
            });
            const bbox = text.getBBox();
            const hasChildren = cfg.children && cfg.children.length > 0;
            rect.attr({
              x:-20,
              y:-15,
              width:170, //节点框的宽度
              height:27,
              textAlign:"left"
            });
            // 文字的位置
            text.attr({
            //   x: -bbox.width / 2 + 15,
            //   y: 2,
              x: 0,
              y:0,
            });
            //   展开折叠图标样式
            if (hasChildren) {
              group.addShape("marker", {
                attrs: {
                //   x: bbox.width / 2 + 24,
                //   y: 0,
                  x: 150,
                  y: 0,
                  r: 6,
                  symbol: cfg.collapsed ? G6.Marker.expand : G6.Marker.collapse,
                  stroke: "#fff",
                  fill: "green",//绿色删除按钮
                  lineWidth: 1,
                },
                name: "collapse-icon",
              });
            }
           
            // 加一个删除按钮
             const deleImage = group.addShape('image', {
              attrs: {
                x: -15,
                y:  bbox.height / 2 -13,
                img: cfg.fixed?'':require('@/assets/image/dele.jpeg'),
                width: bbox.height,
                height: bbox.height,
                cursor: 'pointer'
              },
              name: 'deleteItem'
            })
            return rect;
          },
          update: (cfg, item) => {
            const group = item.getContainer();
            const icon = group.find((e) => e.get("name") === "collapse-icon");
            icon.attr(
              "symbol",
              cfg.collapsed ? G6.Marker.expand : G6.Marker.collapse
            );
          },
        },
        "single-node"
      );

      const container = document.getElementById("container");
      const width = container.scrollWidth;
      const height = container.scrollHeight || 500;
      const graph = new G6.TreeGraph({
        container: "container",
        width,
        height,
        modes: {
          default: [
            {
              type: "collapse-expand",
              onChange: function onChange(item, collapsed) {
                const data = item.get("model");
                graph.updateItem(item, {
                  collapsed,
                });
                data.collapsed = collapsed;
                return true;
              },
            },
            "drag-canvas",
            "zoom-canvas",
          ],
        },
        defaultNode: {
          type: "tree-node",
          anchorPoints: [
            [0, 0.5],
            [1, 0.5],
          ],
        },
        // 节点连接线样式
        defaultEdge: {
          type: "cubic-horizontal",
          style: {
            stroke: "#9fb1f8",
          },
        },
        layout: {
          type: "compactBox",
          direction: "H",
          // 判断节点向左展开还是向右展开
          getSide: (d) => { 
            if (d.data.direction == 'right') {
              return 'right';
            }
            return 'left';
          },
          getId: function getId(d) {
            return d.id+"";
          },
          getHeight: function getHeight() {
            return 16;
          },
          // 节点框和线的宽度
          getWidth: function getWidth() {
            return 70;
          },
          getVGap: function getVGap() {
            return 20;
          },
          getHGap: function getHGap() {
            return 60;
          },
        },
      }); 
      this.graph = graph 
      graph.on('deleteItem:click',(ev)=>{
        const node = ev.item
        const data= node.getModel()
         that.$confirm('是否确认删除?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          if(data.downstreamTable){
            this.$emit("deleteBlood",data.id)
          }else{
            this.$emit("deleteBlood",data.id)
          }
        }).catch(() => {
          that.$message({
            type: 'info',
            message: '已取消删除'
          });          
        });
      })
      graph.data(this.treedata);
      graph.render();
      graph.fitCenter();
      // graph.fitView();
      if (typeof window !== "undefined")
        window.onresize = () => {
          if (!graph || graph.get("destroyed")) return;
          if (!container || !container.scrollWidth || !container.scrollHeight)
            return;
          graph.changeSize(container.scrollWidth, container.scrollHeight);
        };
    },
  },
};
</script>
 
<style scoped>
#nodeDetails {
  list-style: none;
  background-color: blue;
}
#nodeDetails > li {
  padding: 5px 0;
  text-align: left;
  background-color: #ebeefd;
}
::v-deep .g6-component-tooltip {
  background-color: #ccc;
}
.nodeClass {
  padding: 10px;
}
</style>

3、父组件引用

<template>
  <div>
    <G6Tree v-if="treedata.downstreamName" :treedata="treedata" @deleteBlood='deleteBlood'></G6Tree>
  </div>
</template>
<script>
import G6Tree from "@/components/antV/G6Tree.vue";
export default {
  components: {
    G6Tree,
  },
  data() {
    return {
      treedata: {},
    };
  },
  mounted(){
    this.getTree()
  },
  methods: {
    // 获取树节点
    getTree() {
      //调用获取节点的接口
      //数据中id必须为字符串类型，
       this.treedata={
        downstreamName: "中心节点",
        upriverName: "中心节点",
        fixed: true, //是否固定 （固定则不显示删除按钮）
        children: [
          {
            id: "1",
            upriverName: "节点1",
            direction: "right",//展示在中心节点的左边或者右边
            children: [
              {
                id: "2",
                upriverName: "节点1-1",
                direction: "right",
                children:[]
              },
              {
                id: "3",
                upriverName: "节点1-2",
                direction: "right",
                children:[]
              },
            ],
          },
          {
            id: "4",
            upriverName: "节点2",
            direction: "right",
            children: [
              {
                id: "5",
                upriverName: "节点2-1",
                direction: "right",
                children:[]
              },
              {
                id: "6",
                upriverName: "节点2-2",
                direction: "right",
                children:[]
              },
            ],
          },
          {
            id: "7",
            downstreamName: "节点3",
            direction: "left",
            children: [
              {
                id: "8",
                downstreamName: "节点3-1",
                direction: "left",
                children:[]
              },
              {
                id: "9",
                downstreamName: "节点3-2",
                direction: "left",
                children:[]
              },
            ],
          },
          {
            id: "10",
            downstreamName: "节点4",
            direction: "left",
            children: [
              {
                id: "11",
                downstreamName: "节点4-1",
                direction: "left",
                children: [
                  {
                    id: "12",
                    downstreamName: "节点4-1-1",
                    direction: "left",
                    children:[]
                  },
                  {
                    id: "13",
                    downstreamName: "节点4-1-2",
                    direction: "left",
                    children:[]
                  },
                ],
              },
            ],
          },
        ],
       }
    },
    // 删除节点
    deleteTreeNode(id) {
      const param = { id:id }
        //调用删除接口
      api.deleteTreeNode(param)
        .then((res) => {
          if (res.data && res.data.code == 200) {
             this.msgSuccess("删除节点成功");
          }
        })
        .catch((err) => {
          this.$message.error(err);
          console.log(err);
        });
    },
  },
};
</script>