JavaScript实现对象数组按用户分组合并时间字段到entries数组

云上老周

2026-8-29

解决方案

通用groupBy方法仅能完成按指定键归类元素的基础逻辑，不会自动提取公共字段、重组嵌套子数组结构，这是你得到的结果不符合预期的核心原因。直接用下面的单次遍历实现即可，时间复杂度O(n)，性能最优，输出结构完全匹配要求：

const rawData = [
   {"username":"player1","nickname":"PLayer1","capturedate":"06/12/2022","capturetime":"10:05PM"},
   {"username":"player1","nickname":"PLayer1","capturedate":"06/12/2022","capturetime":"10:00PM"},
   {"username":"player1","nickname":"PLayer1","capturedate":"06/12/2022","capturetime":"10:10PM"},
   {"username":"player1","nickname":"PLayer1","capturedate":"06/12/2022","capturetime":"10:15PM"},
   {"username":"player2","nickname":"player2","capturedate":"06/12/2022","capturetime":"10:00PM"},
   {"username":"player2","nickname":"player2","capturedate":"06/12/2022","capturetime":"10:05PM"}
];

const groupMap = new Map();
for (const item of rawData) {
  if (!groupMap.has(item.username)) {
    groupMap.set(item.username, {
      username: item.username,
      nickname: item.nickname,
      entries: []
    });
  }
  groupMap.get(item.username).entries.push({
    capturedate: item.capturedate,
    capturetime: item.capturetime
  });
}

const result = Array.from(groupMap.values());