树菜单递归

• id 自增ID
• pe: 上级ID
• title: 栏目名称

let jn = [
   { id: 1, pe: 0, title: "1" },
   { id: 2, pe: 0, title: "2" },
   { id: 3, pe: 1, title: "3" },
   { id: 4, pe: 2, title: "4" },
   { id: 5, pe: 1, title: "5" },
   { id: 6, pe: 0, title: "6" },
  ];
this.treeData(jn, "id", "pe", "children")

函数体,通过filter方法进行过渡处理

treeData(source, id, parentId, children) {
   let cloneData = JSON.parse(JSON.stringify(source));
   return cloneData.filter(father => {
   // 顶级过滤
    let branchArr = cloneData.filter(child => father[id] === child[parentId]);
    // 子级过滤
    branchArr.length > 0 ? father[children] = branchArr : "";
    return father[parentId] === 0;    // 如果第一层不是parentId=0，请自行修改
   });
  },