<input type="radio" id = "id1"  name = "rdo1" value = "T"/> 开启
<input type="radio" id = "id2"  name = "rdo1" value = "F"/> 关闭

<script type="text/javascript">
$.ajax({
	type: "post",
	url: '<%=request.getContextPath()%>/timeWork/selectonoff.so', //URL 地址 <%  %> 里面写Java代码
	cache:false,
	dataType:"json",
	success: function(msg){
            //msg是后台查询返回的数据值  开：T，关：T
		if (msg.successful) {
			var flag = msg.resultValue;
            // 返回信息
			if (flag == 'T') { //是否相等
				document.getElementById("id1").checked=true;
			} else {
				document.getElementById("id2").checked=true;
			}
		}
	}
});
</script>