您可以使用Array.reduce迭代数据并将其分组。下面是一个带有一些注解的示例：

const data = [
  {
    record: "1",
    host: "a",
    task: "AMQPCSEA",
    taskCount: "1",
    processCount: 1,
  },
  {
    record: "2",
    host: "a",
    task: "MANAGER",
    taskCount: "1",
    processCount: 1,
  },
  {
    record: "3",
    host: "a",
    task: "AMQFQPUB",
    taskCount: "1",
    processCount: 1,
  },
  {
    record: "4",
    host: "b",
    task: "AMQPCSEA",
    taskCount: "1",
    processCount: 2,
  },
  {
    record: "5",
    host: "a",
    task: "MANAGER",
    taskCount: "1",
    processCount: 1,
  },
];

const result = data.reduce((acc, { r, host, task, t, processCount }) => {
  // Check if host already exists in acc
  const itemExists = acc.find((i) => i.host === host);

  if (itemExists) {
    // If hosts is found in acc, next check if the task exists as a key in acc
    const taskExists = acc.some((i) => i[task]);
    
    //Sum the process count if task already exists or record the process count as is
    itemExists[task] = taskExists
      ? { processCount: processCount + itemExists[task].processCount } 
      : { processCount };
  } else {
    //If host doesn't exist in acc, push new object with host into acc along with task and processCount
    acc.push({
      host,
      [task]: { processCount },
    });
  }

  return acc;
}, []);

console.log(result);

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