<input type='radio' id="a" name="radio" />
<input type='radio' id="b" name="radio" />
<input type='radio' id="c" name="radio" />
<input type='radio' id="d" name="radio" />
<p>
<input type='button' value="选中" onclick="document.getElementById('b').click();";
调用那个当选按钮的click方法
<input type='radio' id="b" name="radio" />
<input type='radio' id="c" name="radio" />
<input type='radio' id="d" name="radio" />
<p>
<input type='button' value="选中" onclick="document.getElementById('b').click();";
调用那个当选按钮的click方法
<head>
</head>
<body onload="document.getElementsByName('group')[0].click()">
<input type="radio" name="group" id="g1" onclick="alert(1)"/>
<input type="radio" name="group" id="g2"/>
</body>
</html>