获取对象最大层级

let obj = {
        kk: {
          kk: {
            kk: {
              a: 1,
            },
          },
          kk: [
            {
              kk: {
                kk: 1,
                ll: {},
              },
            },
          ],
        },
      };
      console.log("最大层级：", getMaxLevel(obj));
      function getMaxLevel(source) {
        if (!source && typeof source !== "object") {
          throw new Error("error arguments", "getMaxLevel");
        }
        let max = 0;
        Object.keys(source).forEach((keys) => {
          max = Math.max(max, countOne(source[keys]));
        });
        return max;
      }

      function countOne(item, deep) {
        deep = (deep || 0) + 1;
        var max = deep;
        if (getType(item) === "Object" && JSON.stringify(item) !== "{}") {
          Object.keys(item).forEach((keys) => {
            max = Math.max(countOne(item[keys], deep), max);
          });
        }
        if (getType(item) === "Array" && item.length) {
          Object.keys(item).forEach((keys) => {
            max = Math.max(countOne(item[keys], deep), max);
          });
        }
        return max;
      }

      function getType(data) {
        return Object.prototype.toString.call(data).replace(/(.*\s)|.$/g, "");
      }