vue+element tree(树形控件数据格式)组件的知识点总结

[
            { id: '01', label: '测试活动', pId: '1' },
            { id: '011', label: '测试活动1', pId: '01' },
            { id: '012', label: '测试活动2', pId: '01' },
            { id: '02', label: '测试活动3', pId: '1' },
            { id: '021', label: '测试活动4', pId: '02' },
            { id: '022', label: '测试活动5', pId: '02' },
            { id: '0221', label: '测试活动6', pId: '022' },
            { id: '0222', label: '测试活动7', pId: '022' },
            { id: '0223', label: '测试活动6', pId: '022' },
            { id: '0224', label: '测试活动7', pId: '022' },
            { id: '0225', label: '测试活动6', pId: '022' },
            { id: '0226', label: '测试活动7', pId: '022' },
        ]

    [{
        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'
      }]
    }]

export function toTreeData(data,id,pid,name) {
// 建立个树形结构,需要定义个最顶层的父节点，pId是1
    let parent = [];
    for (let i = 0; i < data.length; i++) {

        if(data[i][pid] !== "1"){
        }else{
          let obj = {
            label: data[i][name],
            id: data[i][id],
            children: []
          };
          parent.push(obj);//数组加数组值
        }
        // console.log(obj);
        //  console.log(parent,"bnm");

    }
    children(parent);

// 调用子节点方法,参数为父节点的数组
function children(parent) {
console.log(parent)
      if (data.length !== 0) {
        for (let i = 0; i < parent.length; i++) {
          for (let j = 0; j < data.length; j++) {
            if (parent[i].id == data[j][pid]){
              let obj = {
                label: data[j][name],
                id: data[j][id],
                children: []
              };
              parent[i].children.push(obj);
            }
          }
          children(parent[i].children);
        }
      }
    }
    console.log(parent,"bjil")
    return parent;
  }
  toTreeData(this.data,"id","pid","label")//这样调用就好使了

  toTreeData(this.data,"id","pid","label")//这样调用就好使了
  //这个回调函数作用当然是转换数组的格式