jquery/j获取raido选中元素/选中值

<div id="testRaidoGroup">
<input type="radio" name="testRaido" value="1" />这是1<br/>
<input type="radio" name="testRaido" value="2" />这是2<br/>
<input type="radio" name="testRaido" value="3" />这是3<br/>
<input type="radio" name="testRaido" value="4" checked="checked"/>这是4<br/>
</div>

//1.获取选中元素
var radioObj=$('#testRadioGroup input[name="testRaido"]:checked ');
//2.获取选中元素值
var value=$(radioObj).val();

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