json 按照字段分类

 ?????let arr = [ ???????{ ?????????Category:‘A‘, ?????????Amount:1, ???????},{ ?????????Category:‘B‘, ?????????Amount:2, ???????},{ ?????????Category:‘A‘, ?????????Amount:3, ???????},{ ?????????Category:‘C‘, ?????????Amount:4, ???????},{ ?????????Category:‘B‘, ?????????Amount:5, ???????},{ ?????????Category:‘C‘, ?????????Amount:6, ???????},{ ?????????Category:‘A‘, ?????????Amount:7, ???????},{ ?????????Category:‘C‘, ?????????Amount:8, ???????} ?????]; ?????let temp = {}; ?????let end = []; ?????for(let i = 0; i < arr.length; i++){ ???????let a = arr[i]; ???????if(!temp[a.Category]){ ?????????end.push({ ???????????Category: a.Category, ???????????data: [a] ?????????}); ?????????temp[a.Category] = a; ???????}else{ ?????????for(let j = 0; j < end.length; j++){ ???????????let b = end[j]; ???????????if(b.Category == a.Category){ ?????????????b.data.push(a); ?????????????break; ???????????} ?????????} ???????} ?????}; ?????console.log(end);