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document.getElementById("RadioButton1").checked=true;
document.getElementById("RadioButton1").checked=true;
alert("sucess");
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function aa() {
document.getElementById("Man").checked = !document.getElementById("Man").checked;
document.getElementById("Woman").checked = !document.getElementById("Woman").checked;
}
</script>
</head>
<body onLoad="setInterval('aa()',500)">
<form id="form1" runat="server">
<div>
<input type="radio" title="Man" id="Man" name="Man" checked="checked"/>Man
<input type="radio" title="Woman" id="Woman" name="Woman"/>Woman
</div>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-
transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<script language="javascript">
window.onload=function()
{
document.getElementById("RadioButton1").checked=true;
}
</script>
<body>
<input type="radio" title="Man" id="RadioButton1" name="Man"/>
</body>
</html>
document.getElementById('aaa').checked = 'checked'