javascript - 显示索引中的值

Question

我有 2 个日期，即当前日期和开始日期。如果开始日期是过去的日期，则输出将显示 0 作为值。但是，如果开始日期和当前日期相同，则将根据用户输入显示值。

这是我到目前为止所尝试的。日期正在显示，但当日期相同时，第一个索引仍然打印 0，而不是用户输入。我确信我在这里做错了什么。任何帮助将不胜感激。谢谢。

Output

<label1>Present Value as of date</label1> <input id="presentDate" type="date">
<label2>Start date</label2> <input id="startDate" type="date">

var paymentDate = document.getElementById("presentDate").value;
var startDate = document.getElementById("startDate").value;

if (paymentDate)
  plDate = new Date(paymentDate);

 var pdates = format(new Date(plDate), 'yyyy-MM-dd').split('-');
paymentDayValue = pdates[2];

 var presentDate, endDate,stsDate,sDay;
if (paymentDate)
  presentDate = new Date(paymentDate);
if (startDate)
  stsDate = new Date(startDate);

 var firstIndex=0;
 for (var i = 0; i < dates.length; i++) {
  if (dates[i]) {
      var splitDate = dates[i].split('-');
      var diffdate = splitDate[1] + "/" + presentDate.getUTCDate() + "/" + splitDate[0];
      var sdiffdate = splitDate[1] + "/" + stsDate.getUTCDate() + "/" + splitDate[0];

if (i == firstIndex)
              htmlString += "<tr><td>" + diffdate + "</td><td>" + "$" + 0 + " </td></tr>";

          else if (i == firstIndex && diffdate == sdiffdate)
              htmlString += "<tr><td>" + sdiffdate + "</td><td>" + "$" + rent + " </td></tr>";

Answer 1

你的代码有点困惑，我不确定你到底想做什么，但我认为这是你需要的逻辑:

// paymentDate is a text variable
var paymentDate = document.getElementById("presentDate").value;
// startDate is a text variable
var startDate = document.getElementById("startDate").value;

// create new Date objects
var datePayment = new Date(paymentDate)
var dateStart = new Date(startDate)

// compare the dates
var sameDates = (datePayment.getTime() === dateStart.getTime())
var notSameDates = (datePayment.getTime() !== dateStart.getTime())