jquery常见操作总结

var value= $("input:radio[name='per'][checked]").val();
$("input[name='testradio']:eq(1)").attr("checked","checked");//
eq(1)表示第二个
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang='zh-CN' xml:lang='zh-CN' xmlns='http://www.w3.org/1999/xhtml'>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
   
    <script type="text/javascript" src="http://www.oschina.net/js/2012/jquery-1.7.1.min.js"></script>
   <script>
	$(function(){
		$("#btnGetRadioValue").click(function(){
			var value=$("input:radio[name='per'][checked]").val();
			alert(value);
		});
		$("#btnSetRadioValue").click(function(){
			var value=$("input:radio[name='per'][checked]").val();
			value=value*1-1;
			if(value==0)
				value=1;
			else
				value=0;
			$("input:radio[name='per']:eq("+value+")").attr("checked","checked");
		});
		$("#btnGetSelectValue").click(function(){
			var value=$("#ddl").val();
			alert(value);
		});
		
		$("#btnSetSelectValue").click(function(){
			var value=$("#ddl option:eq(2)").attr("selected","selected");
		});
	});
   </script>
  </head>
<body>
 1<input type="radio" name="per" value="1"/>
 2<input type="radio" name="per" value="2"/>
 <input type="button" value="GetRadioValue" id="btnGetRadioValue"/>
 <input type="button" value="SetRadioValue" id="btnSetRadioValue"/><br/>
 <select id="ddl">
	<option value="-1">--</option>
	<option value="1">1</option>
	<option value="2">2</option>
 </select>
 <input type="button" value="GetSelectValue" id="btnGetSelectValue"/>
  <input type="button" value="SetSelectValue" id="btnSetSelectValue"/>
</body>
</html>