code: Add comments and rename vars for treeAsJson.
code: Add comments and rename vars for treeAsJson.

bloodybear/yona,doortts/fork-yobi,Limseunghwan/oss,yona-projects/yona,Limseunghwan/oss,brainagenet/yobi,doortts/fork-yobi,yona-projects/yona,ihoneymon/yobi,ChangsungKim/TestRepository01,Limseunghwan/oss,ihoneymon/yobi,ahb0327/yobi,ahb0327/yobi,doortts/forked-for-history,yona-projects/yona,doortts/fork-yobi,ChangsungKim/TestRepository01,oolso/yobi,violetag/demo,brainagenet/yobi,naver/yobi,oolso/yobi,naver/yobi,bloodybear/yona,brainagenet/yobi,ihoneymon/yobi,bloodybear/yona,naver/yobi,doortts/forked-for-history,doortts/fork-yobi,violetag/demo,ahb0327/yobi,bloodybear/yona,yona-projects/yona,oolso/yobi,doortts/forked-for-history