将插入的零插入到javascript中的日期数组中

假设一天中的时间是相同的,并且基于Darren Sweeney的建议:

const data = [
    [1391032800000, 20],
    [1389826800000, 4]
];

// getting min and max dates in the array
const timestamps = data.map(([timestamp]) => timestamp);
const [min, max] = [Math.min(...timestamps), Math.max(...timestamps)];

// creating hash where evrey day in the range between min and max dates has a value of 0
let dataObj = {};
let tempTimestamp = min;

while (tempTimestamp <= max) {
    dataObj[tempTimestamp] = 0;
    tempTimestamp += 86400000;
}

// lopping through the original array and populating a "zero-valued" hash with values from original array
data.forEach(([timestamp, value]) => {
    dataObj[timestamp] = value;
})

// converting a hash into array
const result = Object.keys(dataObj).map(timestamp => ([timestamp, dataObj[timestamp]]));

getDate reduce

var arrays = [
  ["A", [
    [1391032800000, 20],
    [1389826800000, 4],
    [1389913200000, 4],
    [1390086000000, 6]
  ]]
];
var dates = arrays[0][1].sort(function(x, y) {
  return x[0] - y[0];
});
var map = dates.map(function(dt) {
  return [new Date(dt[0]), dt[1]];
});

var result = map.reduce((r, [e], i, arr) => {
  if (i != 0) {
    let date = e.getDate();
    let prev = arr[i - 1][0].getDate();
    r.push(...Array(date - prev - 1).fill(0))
  }
  r.push([e]);
  return r;
}, [])


console.log(result)