Question

这是我的JSON数据：

{
  "EF": [
    {
      "OP": "op1",
      "pound": 2000,
      "Date": "2012-1-13T00:00:00.000Z"
    },
    {
      "OP": "op1",
      "pound": 1800,
      "Date": "2014-12-6T00:00:00.000Z"
    },
    {
      "OP": "op2",
      "pound": 300,
      "Date": "2013-6-1T00:00:00.000Z"
    }
  ]
}

我希望计数每个参数值，排序它们从最大到最小，以得到这样的表：

OP：op1（2），OP2（1）磅：2000,1800,300日期： 2014-12-6T00：00：00.000Z，2013-6-1T00：00：00.000Z， 2012-1-13T00：00：00.000Z

我尝试使用d3.nest（），但我没有取得多大成功。有什么想法吗？

Answer 1

＆＃13;

//JSON from db?
var json = {
  "EF": [{
    "OP": "op1",
    "pound": 2000,
    "Date": "2012-1-13T00:00:00.000Z"
  }, {
    "OP": "op1",
    "pound": 1800,
    "Date": "2014-12-6T00:00:00.000Z"
  }, {
    "OP": "op2",
    "pound": 300,
    "Date": "2013-6-1T00:00:00.000Z"
  }]
};

//Sort based on pound
json.EF.sort(function(a, b) {
  if (a.pound < b.pound) return 1;
  if (a.pound > b.pound) return -1;
  return 0;
});

var hash = {}; //Keep track of counts
//Count the values
for (var i in json.EF) {
  var obj = json.EF[i];
  if (hash[obj.OP]) {
    hash[obj.OP] += 1;
  } else {
    hash[obj.OP] = 1;
  }
}

//Sorted
console.log("SORTED:", json);
console.log("COUNTS:", hash);

//Now, when you loop through the json to display the values, just check the counts and display them

＆＃13;

JSON使用Javascript计算和排序

1 个答案: