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jquery 如何设置单选框的第一个或最后一个radio为选中值

WBOY
Release: 2016-06-01 09:54:50
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本实例需要使用到的html代码: 

<code class="language-html"><input type="radio" name="rd" id="rd1" value="1">1
<input type="radio" name="rd" id="rd2" value="2">2
<input type="radio" name="rd" id="rd3" value="3">3</code>
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设置第一个Radio为选中值: 

<code class="language-javascript">$('input:radio:first').attr('checked', 'checked'); 
或者 
$('input:radio:first').attr('checked', 'true'); </code>
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设置最后一个Radio为选中值: 

<code class="language-javascript">$('input:radio:last').attr('checked', 'checked'); 
或者 
$('input:radio:last').attr('checked', 'true'); </code>
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注: attr("checked",'checked')= attr("checked", 'true')= attr("checked", true) 

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