圖一：原數(shù)據(jù)，圖二：期望得到的樹形數(shù)據(jù)

圖1

圖2

toTree(data)?{//-data為原數(shù)據(jù)數(shù)組

??????let?result?=?[];

??????if?(!Array.isArray(data))?{

????????return?result;

??????}

??????data.forEach((item)?=>?{

????????delete?item.children;

??????});

??????let?map?=?{};

??????data.forEach((item)?=>?{

????????map[item.id]?=?item;

??????});

??????data.forEach((item)?=>?{

????????let?parent?=?map[item.parentid];

????????if?(parent)?{

??????????(parent.children?||?(parent.children?=?[])).push(item);

????????}?else?{

??????????result.push(item);

????????}

??????});

??????//?console.log(12,result)//最新數(shù)據(jù)

??????this.result?=?result;

??????return?result;

????},