（JavaScript）脚本不会只计数一次，也许不能识别变量？

Question

I'm sure this is a super easy fix and I just can't see it.. I have a play button and I only want it to write to database (inc playcount) only when it's clicked the first time.

Any idea why this doesn't work? This result counts every click, and if I do if countonce = 0 and declare at beginning as 0 it won't count any clicks. Am I misunderstanding javascript?

 <div id="left-05-play_">
 <script type="text/javascript">
 var currsong = 1;
 var playcountadd = document.getElementById('left-05-play_');
 playcountadd.onclick = function() {
 if (countonce != 1) {
 $.post( "php/songadd.php", { addsong: "1", } );
 var countonce = 1;
 } }
 </script>
 </div>

Thank-you for taking the time to read this question.

Answer 1

This should do the trick.

var currsong = 1;
var songadded = false;
var playcountadd = document.getElementById('left-05-play_');

playcountadd.onclick = function() {
   if (!songadded) {
      $.post( "php/songadd.php", { addsong: "1", } );
      songadded = true;
   }
}

• Changed countonce to songadded
• Moved songadded out of onclick function
• Changed songadded to boolean logic
• Check whether songadded=false before proceeding with AJAX post