Question

对象数组是动态的

活动可以分为四种类型：“空闲”，“向下”，“向上”，“正在等待”

如果活动状态为打开，则下一个活动状态为关闭，但活动相同。

如何转换为我的预期输出？

var arr = [
  { Activity: 'Idle', Activity_Status: 'Open', Activity_Date: "2018-09-02T12:30:00.000Z" },
  { Activity: 'Idle', Activity_Status: 'Close', Activity_Date: "2018-09-02T14:00:00.000Z"},
  { Activity: 'Down', Activity_Status: 'Open',  Activity_Date: "2018-09-02T17:30:00.000Z" },
  { Activity: 'Down', Activity_Status: 'Close', Activity_Date: "2018-09-02T19:00:00.000Z"}
]

预期输出为：

[
  { Activity: 'Idle', From: "2018-09-02T12:30:00.000Z", To: "2018-09-02T14:30:00.000Z" },
  { Activity: 'Down', From: "2018-09-02T17:30:00.000Z", To: "2018-09-02T19:00:00.000Z" }
]

Answer 1

我将创建一个键为“活动”值的对象，然后从结果对象获取值以产生所需的输出。

var arr = [{
  Activity: 'Idle',
  Activity_Status: 'Open',
  Activity_Date: "2018-09-02T12:30:00.000Z"
}, {
  Activity: 'Idle',
  Activity_Status: 'Close',
  Activity_Date: "2018-09-02T14:00:00.000Z"
}, {
  Activity: 'Down',
  Activity_Status: 'Open',
  Activity_Date: "2018-09-02T17:30:00.000Z"
}, {
  Activity: 'Down',
  Activity_Status: 'Close',
  Activity_Date: "2018-09-02T19:00:00.000Z"
}]

var result = arr.reduce((mem, cur) => {
  var key = cur.Activity;
  if (mem[key]) {
    return cur['Activity_Status'] === 'Open' ? { ...mem,
        [key]: { ...mem[key],
          "From": cur['Activity_Date']
        }
      } :
      { ...mem,
        [key]: { ...mem[key],
          "To": cur['Activity_Date']
        }
      }
  } else {
    return cur['Activity_Status'] === 'Open' ? { ...mem,
        [key]: { ...mem[key],
          "From": cur['Activity_Date'],
          Activity: key
        }
      } :
      { ...mem,
        [key]: { ...mem[key],
          "To": cur['Activity_Date'],
          Activity: key
        }
      }
  }
}, {});

console.log(Object.values(result));

Answer 2

由于 open 状态紧随其后的是 close 状态，因此请使用简单的for循环，通过执行{{1} }，并针对每次迭代合并当前对象和下一个对象，如下所示：

i += 2

示例：

var result = [];
for(var i = 0; i < arr.length; i += 2) {
  result.push(
    { Activity: arr[i].Activity, From: arr[i].Activity_Date, To: arr[i + 1].Activity_Date }
  );
}

如果您想要一种实用的方法，那么：

var arr = [ { Activity: 'Idle', Activity_Status: 'Open', Activity_Date: "2018-09-02T12:30:00.000Z" }, { Activity: 'Idle', Activity_Status: 'Close', Activity_Date: "2018-09-02T14:00:00.000Z"}, { Activity: 'Down', Activity_Status: 'Open',  Activity_Date: "2018-09-02T17:30:00.000Z" }, { Activity: 'Down', Activity_Status: 'Close', Activity_Date: "2018-09-02T19:00:00.000Z"} ];

var result = [];
for(var i = 0; i < arr.length; i += 2) {
  result.push(
    { Activity: arr[i].Activity, From: arr[i].Activity_Date, To: arr[i + 1].Activity_Date }
  );
}

console.log(result);

示例：

let result = Array.from({length: arr.length / 2}).map((_, i) =>
  ({ Activity: arr[i].Activity, From: arr[i].Activity_Date, To: arr[i + 1].Activity_Date })
);

Answer 3

<script>
var arr = [{Activity: 'Idle',
              Activity_Status: 'Open',
              Activity_Date: "2018-09-02T12:30:00.000Z" },
            {Activity: 'Idle',
              Activity_Status: 'Close',
              Activity_Date: "2018-09-02T14:00:00.000Z"}, 
            {Activity: 'Down',
              Activity_Status: 'Open',
              Activity_Date: "2018-09-02T17:30:00.000Z" },
            {Activity: 'Down',
              Activity_Status: 'Close',
              Activity_Date: "2018-09-02T19:00:00.000Z"}];

var output = [
{Activity: 'Idle', From: "", To: "" },
{Activity: 'Down', From: "", To: "" },
{Activity: 'Up', From: "", To: "" },
{Activity: 'Waiting', From: "", To: ""}
];

var i =0;
while(i < output.length){

  var j = 0;
  var activity = output[i]["Activity"];
  while(j < arr.length){

    if(arr[j]["Activity"] == activity){
    
      if(arr[j]["Activity_Status"] == "Open"){
      
      output[i]["From"] = arr[j]["Activity_Date"];
      
      }else if(arr[j]["Activity_Status"] == "Close"){
      
      output[i]["To"] = arr[j]["Activity_Date"];
      
      }
    
    }

  j++;

  }

i++;

}

console.log(output);
              
</script>

javascript数组转换为特定格式

3 个答案: