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52 { let childId = cur.childId; if (!acc[childId]) { acc[childId] = []; } acc[childId].push(cur); return acc; },{}) json1.forEach(item => { item.childchild = json2Obj[item.childId] }) let json1Obj = json1.reduce((acc,cur) => { let mainId = cur.mainId; if (!acc[mainId]) { acc[mainId] = []; } acc[mainId].push(cur); return acc; },{}) json.forEach(item => { item.child = json1Obj[item.mainId]; }) console.log(JSON.stringify(json)); 方法二： const toObj = (json,idStr) => json.reduce((acc,cur) => { let id = cur[idStr]; if (!acc[id]) { acc[id] = []; } acc[id].push(cur); return acc; },{}) const json2Obj = toObj(json2,'childId'); json1.forEach(item => item.childchild = json2Obj[item.childId]) const json1Obj = toObj(json1,'mainId'); json.forEach(item => item.child = json1Obj[item.mainId]) console.log(JSON.stringify(json));