jquery - 如何使用each()选择第一个 radio ？

Question

使用Jquery.each选择第一个单选按钮

是否有任何选项可以从每个 div 中选择第一个 radio

<div>
<table class="sortable accountTable float_left">
      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group1" checked='checked' /></td>
        <td>Organisation structure 1</td>
      </tr>
      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group2" /></td>
        <td>Organisation structure 2</td>
      </tr>

      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group3" /></td>

        <td>Organisation structure 3</td>
      </tr>
      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group4" /></td>
        <td>Organisation structure 4</td>
      </tr>
</table>
 </div>
<div>
<table class="sortable accountTable float_left">
      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group1" checked='checked' /></td>
        <td>Organisation structure 1</td>
      </tr>
      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group2" /></td>
        <td>Organisation structure 2</td>
      </tr>

      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group3" /></td>

        <td>Organisation structure 3</td>
      </tr>
      <tr>
        <td class="textlmiddle"><input name="acc_number2" type="radio" value="" rel=
        ".structure_group4" /></td>
        <td>Organisation structure 4</td>
      </tr>
</table>
 </div>
<div>
<table class="sortable accountTable float_left">
      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group1" checked='checked' /></td>
        <td>Organisation structure 1</td>
      </tr>
      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group2" /></td>
        <td>Organisation structure 2</td>
      </tr>

      <tr>
        <td class="textlmiddle"><input type="radio" value="" rel=
        ".structure_group3" /></td>

        <td>Organisation structure 3</td>
      </tr>
      <tr>
        <td class="textlmiddle"><input name="acc_number2" type="radio" value="" rel=
        ".structure_group4" /></td>
        <td>Organisation structure 4</td>
      </tr>
</table>
 </div>

​这里是 DEMO

Answer 1

我相信这会起作用:

$('body > div').each(function() {
    $('input[type="radio"]', this).first().prop('checked', true);
});