javascript - 如何将先前索引值的总和存储在一个数组中？

Question

这里我更新了我的示例代码，

var distanceSumOfprev = 0;
          var distancesArr = [1000, 2000, 1000, 2000, 1000, 2000];
          for (var i = 1; i < distancesArr.length; i++) {
            distanceSumOfprev += distancesArr[i]
            console.log(distanceSumOfprev);
          }

这是我目前得到的

  distanceSumOfprev = [2000, 3000, 5000, 6000, 8000];

预期结果

distanceSumOfprev = [2000, 4000, 6000, 7000, 9000];

Answer 1

var distancesArr = [1000, 2000, 1000, 2000, 1000, 2000];
// since we need to add each value with value at previous index, distanceSumOfprev is initialized with value corresponding to first index.
var distanceSumOfprev = distancesArr[0];
for (var i = 0; i < distancesArr.length - 1; i++) {
  //distanceSumOfprev will be having the sum of all values upto the index pointing to current loop variable.
  distanceSumOfprev += distancesArr[i + 1];
  console.log(distanceSumOfprev);
}

请检查一下