我不知道为什么按钮不起作用。我想要做的是，当我单击按钮时，每个选中“卡”框的神奇宝贝不再出现。它不起作用。我刚刚开始编码，当你读到这篇文章时，你可能会微笑。这一切都非常令人困惑。

function showUnowned() {
  var rows = document.getElementsByTagName("tr");
  for (var i = 0; i < rows.length; i++) {
    if (rows[i].getElementsByTagName("input")[2].checked == true) {
      rows[i].style.display = "none";
    }
  }
}

<h1>My Pokemon Card Collection</h1>
<table>
  <tr>
    <th>Picture</th>
    <th>Name</th>
    <th>Pokedex Number</th>
    <th>Card</th>
    <th>Other</th>
  </tr>
  <!-- This is an example of how to add a Pokemon to the table. You can copy and paste this code for each Pokemon in your collection. -->
  <tr>
    <td><img src="https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/1.png"></td>
    <td>Bulbasaur</td>
    <td>1</td>
    <td><input type="checkbox"></td>
    <td><input type="checkbox"></td>
  </tr>
  <tr>
    <td><img src="https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/2.png"></td>
    <td>Ivysaur</td>
    <td>2</td>
    <td><input type="checkbox"></td>
    <td><input type="checkbox"></td>
  </tr>
  <tr>
    <td><img src="https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/3.png"></td>
    <td>Venusaur</td>
    <td>3</td>
    <td><input type="checkbox"></td>
    <td><input type="checkbox"></td>
  </tr>
  <tr>
    <td><img src="https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/4.png"></td>
    <td>Charmander</td>
    <td>4</td>
    <td><input type="checkbox"></td>
    <td><input type="checkbox"></td>
  </tr>



</table>
<button onclick="showUnowned()">Show Unowned Pokemon</button>