一個數(shù)組

var nodes = [
    {"id":0,"title":"第一級1","parentid":0},
    {"id":1,"title":"第二級1","parentid":2},
    {"id":2,"title":"第二級2","parentid":2},
    {"id":3,"title":"第三級1","parentid":4},
    {"id":4,"title":"第三級2","parentid":3}
];

轉(zhuǎn)成的樹結(jié)構(gòu)

var treeData = {
    "id": "2",
    "title": "第一級1",
    "children": [
        {
            "id": "3",
            "title": "第二級1",
            "children": [
                {
                    "id": "6",
                    "title": "第三級2",
                    "children": [
                        
                    ]
                }
            ]
        },
        {
            "id": "4",
            "title": "第二級2",
            "children": [
                {
                    "id": "5",
                    "title": "第三級1",
                    "children": [
                        
                    ]
                }
            ]
        }
    ]
}

代碼如下：

  var nodes = [
      { "id": 2, "title": "第一級1", "parentId": 0 },
      { "id": 3, "title": "第二級1", "parentId": 2 },
      { "id": 4, "title": "第二級2", "parentId": 2 },
      { "id": 5, "title": "第三級1", "parentId": 4 },
      { "id": 6, "title": "第三級2", "parentId": 3 }
    ];
    function convertToTreeData(data, pid) {
      const result = [];
      let temp = [];
      for (let i = 0; i < data.length; i++) {
        if (data[i].parentId === pid) {
          const obj = { 'title': data[i].title, 'id': data[i].id }
          temp = convertToTreeData(data, data[i].id)
          if (temp.length > 0) {
            obj.children = temp
          }
          result.push(obj)
        }
      }
      return result;
    }
    const treeData = convertToTreeData(nodes, 0);
    console.log(treeData);

參數(shù)說明請參考原文，地址如下：《原文鏈接》