javascript - JavaScript 和 Moment.js 无法正确评估日期范围内的日期

Question

如果这看起来是一个愚蠢的问题，我提前道歉，但我以前从未使用过 Moment.js。

我有以下方法(从以前的开发人员继承的代码)，并且无法理解为什么评估不起作用。我确信这是一件微不足道的事情。

注意:只有 if 语句中的日期 >= weekOne 才能计算出正确的日期。即使日期匹配，其他 else if 子句也不会计算。

var myObject = $scope.uptimeData;
var uptimeTotal = [];
if (myObject) {
    var weekOne = moment().subtract(7, "days").format("YYYY-MM-DD");
    var weekTwo = moment().subtract(14, "days").format("YYYY-MM-DD");
    var weekThree = moment().subtract(21, "days").format("YYYY-MM-DD");
    var weekFour = moment().subtract(28, "days").format("YYYY-MM-DD");
    var weekFive = moment().subtract(35, "days").format("YYYY-MM-DD");
    var weekSix = moment().subtract(42, "days").format("YYYY-MM-DD");
    var weekSeven = moment().subtract(49, "days").format("YYYY-MM-DD");

    var weekOneTotalSuccess = 0;
    var weekTwoTotalSuccess = 0;
    var weekThreeTotalSuccess = 0;
    var weekFourTotalSuccess = 0;
    var weekFiveTotalSuccess = 0;
    var weekSixTotalSuccess = 0;
    var weekOneTotalFail = 0;
    var weekTwoTotalFail = 0;
    var weekThreeTotalFail = 0;
    var weekFourTotalFail = 0;
    var weekFiveTotalFail = 0;
    var weekSixTotalFail = 0;
    Object.keys(myObject).map(function (key, index) {
        if (myObject[key].successes) {
            if (key >= weekOne) {
                weekOneTotalSuccess = weekOneTotalSuccess + myObject[key].successes;
            } else if (key >= weekTwo && key < weekThree) {
                weekTwoTotalSuccess = weekTwoTotalSuccess + myObject[key].successes;
            } else if (key >= weekThree && key < weekFour) {
                weekThreeTotalSuccess = weekThreeTotalSuccess + myObject[key].successes;
            } else if (key >= weekFour && key < weekFive) {
                weekFourTotalSuccess = weekFourTotalSuccess + myObject[key].successes;
            } else if (key >= weekFive && key < weekSix) {
                weekFiveTotalSuccess = weekFiveTotalSuccess + myObject[key].successes;
            } else if (key >= weekSix && key < weekSeven) {
                weekSixTotalSuccess = weekSixTotalSuccess + myObject[key].successes;
            }
            else {

            }
        }
    }
}

以下是数据示例:

"2017-05-03": {
  "failures": 816, 
  "successes": 18378
}, 
"2017-05-04": {
  "failures": 1067, 
  "successes": 22302
}, 
"2017-05-05": {
  "failures": 1008, 
  "successes": 82599
}, 
"2017-05-07": {
  "failures": 2724, 
  "successes": 142854
}, 
"2017-05-08": {
  "failures": 1329, 
  "successes": 149028
}

Answer 1

问题

您正在比较两个字符串。例如，在第一次迭代中，您的值如下:

key => "2017-05-03"
weekOne => moment().subtract(7, "days").format("YYYY-MM-DD"); /* which returns a formatted string */

>和<运算符并不是真正注定要与字符串类型变量一起使用。

Note : Each of these operators will call the valueOf() function on each operand before a comparison is made.

回答

只要你使用Moment.js，就应该引用the MomentJS Query documentation section为了比较一个日期是否早于或晚于另一个日期。