Question

我正在尝试进行数据可视化，我需要知道如何对每个月的所有值求和，还有JSON数据：

var data = [
  {
    "created_at": "2016-01-06",
    "commission": "238.00"
  },

  {
    "created_at": "2016-01-12",
    "commission": "538.00"
  },

  {
    "created_at": "2016-02-02",
    "commission": "12.00"
  },

  {
    "created_at": "2016-03-06",
    "commission": "113.00"
  },

  {
    "created_at": "2016-03-18",
    "commission": "212.00"
  }
];

这是每月汇总所有委托价值的算法：

var months = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];

var date;
for (var i = 0; i < data.length; i++) {
  date = new Date(data[i].created_at);
  if (date.getFullYear() == 2016) {
    months = months[date.getMonth()] += +data[i].commission;
  }
}
//excepted result would be [776, 12, 325, 0, 0, 0, 0, 0, 0, 0, 0, 0]
alert(months);

我无法弄清楚这个逻辑，它返回了第一个委托或NaN索引。例外结果将是每月添加值的数组，如下所示：[776,12,325,0,0,0,0,0,0,0,0]

有JSfiddle https://jsfiddle.net/md57g0qq/1/

Answer 1

你有一个错字。将months = months[date.getMonth()] += +data[i].commission;更改为months[date.getMonth()] += +data[i].commission;

fiddle

Answer 2

var data = [

  {
    "created_at": "2016-01-06",
    "commission": "238.00"
  },

  {
    "created_at": "2016-01-12",
    "commission": "538.00"
  },

  {
    "created_at": "2016-02-02",
    "commission": "12.00"
  },

  {
    "created_at": "2016-03-06",
    "commission": "113.00"
  },

  {
    "created_at": "2016-03-18",
    "commission": "212.00"
  }


];


var months = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];

var date;
for (var i = 0; i < data.length; i++) {
  date = new Date(data[i].created_at);
  if (date.getFullYear() == 2016) {
    months[date.getMonth()] = parseFloat(months[date.getMonth()]) + parseFloat( data[i].commission);
  }
}

//excepted result would be [776, 12, 325, 0, 0, 0, 0, 0, 0, 0, 0, 0]
alert(months);

将每个月的所有值从JSON汇总到Array

2 个答案: