<html>
<head>
<script type="text/javascript" src="./jquery.min.js"></script>
</head>
<body>
<div>
<input id="rdo1" name="rdo1" type="radio" value="1" checked="checked"/>是
<input id="rdo1" name="rdo1" type="radio" value="0"/>否
<button id="btn1">是</button>
<button id="btn2">否</button>
<div>
<script type="text/javascript">
$(function(){
$("#btn1").click(function(){
$("input[name='rdo1']").eq(0).attr("checked","checked")
$("input[name='rdo1']").eq(1).removeAttr("checked")
$("input[name='rdo1']").eq(0).click()
})
$("#btn2").click(function(){
$("input[name='rdo1']").eq(0).removeAttr("checked")
$("input[name='rdo1']").eq(1).attr("checked","checked")
$("input[name='rdo1']").eq(1).click()
})
})
</script>
</body>
</html>
设置radio的checked属性为ture即为选中。<input type="radio" id="radioId" value="1" >
选中单选框JS代码：
var target = document.getElementById("radioId")
target.checked = true
附完整代码：
<!DOCTYPE html>
<!--STATUS OK-->
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta http-equiv="content-type" content="text/htmlcharset=gbk" />
<meta property="wb:webmaster" content="3aababe5ed22e23c" />
<meta name="referrer" content="always" />
<title>demo</title>
</head>
<body>
<input type="radio" value="radio1" id="radio1" name="radio"/><label for="radio1">RADIO 1</label>
<input type="radio" value="radio2" id="radio2" name="radio"/><label for="radio2">RADIO 2</label>
<input type="radio" value="radio3" id="radio3" name="radio"/><label for="radio3">RADIO 3</label>
<input type="radio" value="radio4" id="radio4" name="radio"/><label for="radio4">RADIO 4</label>
<br/><br/>
<button onclick="selectRadio('radio1')">选中radio1</button>
<button onclick="selectRadio('radio2')">选中radio2</button>
<button onclick="selectRadio('radio3')">选中radio3</button>
<button onclick="selectRadio('radio4')">选中radio4</button>
<br/>
<br/>
</body>
<script type="text/javascript">
function selectRadio(radioId) {
var target = document.getElementById(radioId)
target.checked = true
}
</script>
</html>
