无法获取if语句以比较javascript中的两个字符串

Question

In my code when i equals 5 myDate should be equal to it. The alert shows me that they are the same. I can never get the function to return 1;

function checkForHoliday(date) {
    var myDate = new Date(date);
    myDate = myDate.getMonth() + "/" + myDate.getDate() + "/" + myDate.getFullYear();

    alert(myDate + "\n" + holidays[5]);

    for (i = 0; i <= 9; i++) {
       if (myDate == holidays[i]) {
           return 1;
           alert("got it");
       }       
    }

    return 0;
}

This is what the string in the array looks like:

year = 2013
holidays[5] = "7/2/" + year

My alert shows me this:

Answer 1

I have run your code locally, and have it working.

I'm going to guess that your issue stems from the fact that Date.getMonth() returns month numbers where January === 0. That throws a lot of people off.

To recreate your code, I simply used Chrome's console. I also changed your alert to a console.log to save myself the hassle of using alert .

Here's the code:

function checkForHoliday(date) {
  var myDate = new Date(date);
  myDate = myDate.getMonth() + "/" + myDate.getDate() + "/" + myDate.getFullYear();

  console.log(myDate + "\n" + holidays[5]);

  for (i = 0; i <= 9; i++) {
    if (myDate == holidays[i]) {
      return 1;
    }
  }

  return 0;
}

And a fake holiday array:

holidays = [0,1,2,3,4,'7/2/2013']

(The 7 here actually corresponds to August)

Upon running checkForHoliday('8/2/2013') , the console reports back a response of 1 . The code successfully matches the date.

If you actually intended for holiday[5] to represent July 2nd, 2013, you'll need to set holiday[5] = '6/2/2013' .

Answer 2

Try Using this,

 <script type="text/javascript">

    var startYear = parseInt(document.getElementById('startYear'), 10);
    var startMonth = parseInt(document.getElementById('startMonth'), 10) - 1; 
    var startDay = parseInt(document.getElementById('startDay'), 10);
    var myDate = new Date(startYear, startMonth, startDay);

</script>

Answer 3

Convert the date object to string in desired format. Use triple equals operator to test equality.

Try:

if (myDate.toLocaleDateString() === holidays[i]) {
    return 1;
    alert("got it");
}