javascript - 在 JS 中第 n 次出现切片/拆分

Question

我有一个由“|”分隔的字符串组成的数组：

LOG: 380|2|choice|Question_8_13240_1351170102936|||incorrect|2012-10-25T15:01:13|1|<ln>380|2|choice|Question_10_13280_1351170102995|||incorrect|2012-10-25T15:01:17|1| 

并且需要从每个字符串中获取 Question_8_13240_1351170102936 以便我可以查看是否有任何重复的问题，因此第三次出现“|”之后的字符串 4号之前

构建数组的代码：

 AssessmentManager.prototype.submit = function () {
  assessData = "";
  assessmentItemsLength = this.assessmentItems.length;
  for (i = 0; i < this.assessmentItems.length; i++) {
    if (!this.assessmentItems[i].getSubmitted()) {
      assessmentFlatDataItem = this.assessmentItems[i].getFlatData();
      if (assessmentFlatDataItem.length > 0) {
        if (assessData.length > 0)
          assessData += "<ln>";
          assessData += assessmentFlatDataItem;
        }
      }
    }
  }

然后GetFlatdata：

  AssessmentItem.prototype.getFlatData = function () {
  result = _userScormModuleId + "|";

  if (this._interactionIdx)
    result += this._interactionIdx;
  result += "|";

  if (this._interactionType)
    result += this._interactionType
  result += "|";

  if (this._interactionId)
    result += this._interactionId
  result += "|";

  if (this._learnerResponse)
    result += this._learnerResponse
  result += "|";

  if (this._correctResponse)
    result += this._correctResponse
  result += "|";

  if (this._result)
    result += this._result
  result += "|";

  if (this._timeStamp)
   result += this._timeStamp
  result += "|";

 if (this._weighting)
   result += this._weighting
 result += "|";

 if (this._description)
  result += this._description

  return result;
}

我将如何实现这一目标？谢谢

我现在有这个：

 learnerResponsesArray.push({ 
    key: j,
    value:  this.assessmentItems.split('<ln>')
  });

然后循环通过 learnerResponsesArray？

Answer 1

var cells = mystring.split("|");
// nth item...
var myitem = cells[n];

但正如@mori57 所说，为什么要使用这种格式而不是 JSON？

Answer 2

尝试这个

str = "LOG: 380|2|choice|Question_8_13240_1351170102936|||incorrect|2012-10-25T15:01:13|1|<ln>380|2|choice|Question_10_13280_1351170102995|||incorrect|2012-10-25T15:01:17|1| "
console.log(str.split(":")[1].split("|")[3])

Answer 3

如果您需要 3d 和 4th 之间的值|，可以使用：

var fourthelement = [yourstring].split(/\|/,4).pop();