05

      var jsonData = eval(`[
      {"id":"4","pid":"1","name":"大家电"},
      {"id":"5","pid":"1","name":"生活电器"},
      {"id":"1","pid":"0","name":"家用电器"},
      {"id":"2","pid":"0","name":"服饰"},
      {"id":"3","pid":"0","name":"化妆"},
      {"id":"7","pid":"4","name":"空调"},
      {"id":"8","pid":"4","name":"冰箱"},
      {"id":"9","pid":"4","name":"洗衣机"},
      {"id":"10","pid":"4","name":"热水器"},
      {"id":"11","pid":"3","name":"面部护理"},
      {"id":"12","pid":"3","name":"口腔护理"},
      {"id":"13","pid":"2","name":"男装"},
      {"id":"14","pid":"2","name":"女装"},
      {"id":"15","pid":"7","name":"海尔空调"},
      {"id":"16","pid":"7","name":"美的空调"},
      {"id":"19","pid":"5","name":"加湿器"},
      {"id":"20","pid":"5","name":"电熨斗"}
      ]`);

      function transData(data, idStr, pidStr, chindrenStr) {
        var arr = [],
          hash = {},
          id = idStr,
          pid = pidStr,
          children = chindrenStr;

        for (var i = 0; i < data.length; i++) {
          hash[data[i][id]] = data[i];
        }
        for (var j = 0; j < data.length; j++) {
          //data 中每一项
          var arrVal = data[j],
            //找父分类
            hashVP = hash[arrVal[pid]];
          //pid 不为 0
          if (hashVP) {
            !hashVP[children] && (hashVP[children] = []);
            hashVP[children].push(arrVal);
          }
          //pid 为 0
          else {
            // 将data 的对象添加到数组中
            arr.push(arrVal);
          }
        }
        return arr;
      }

      var jsonDataTree = transData(jsonData, 'id', 'pid', 'chindren');
      console.log(jsonDataTree);