如何获取表tds的类名并将其写入到使用jQuery的数组？

Question

I have HTML table with three rows and three cells for each row. Each cell has class name. I want to get the class name of each cell and write it to array.

HTML table:

<table>
    <tr>
        <td class="O-marker"></td>
        <td class="O-marker"></td>
        <td class="X-marker"></td>
    </tr>
    <tr>
        <td class="X-marker"></td>
        <td class="O-marker"></td>
        <td class="X-marker"></td>
    </tr>
    <tr>
        <td class="X-marker"></td>
        <td class="O-marker"></td>
        <td class="O-marker"></td>
    </tr>
</table>

When the getBoard function is called, then get all the class names of cells and write it to board array.

function getBoard() {
   var board = [];
   return board;
}

I want to use jQuery and .each() method to get the class name and push the first character into the array board . Example. By the first character I mean (X or O).

Answer 1

Using vanilla JS:

function getBoard() {
  var board = [];
  var tds = document.getElementsByTagName('td');
  for (var i = 0; i < tds.length; i += 1) {
    board.push(tds[i].className[0]);
  }
  return board;
}

Or in jQuery:

function getBoard() {
  var board = [];
  $('td').each(function(){
    board.push(this.className[0]);
  });
  return board;
}

Answer 2

Using jQuery:

function getBoard() {
   var board = [];

   $('.table td').each(function (index) {
       board.push($(this).attr('class')[0]);
   });

   return board;
}

console.log(getBoard());

You can treat the string as an array (sort of?) and get the first character with [0] .