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【PHP】
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http://www.w3school.com.cn/jquery/jquery_ref_events.asp
性别默认选择第一个：
<script>
function add(){
$('input[ name=sex ]').get(0).checked=ture;
}
</script>
<strong>
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<!DOCTYPE html>
2 <html>
3 <body>
4
5 <h1>我的第一段 JavaScript</h1>
6
7 <p id="demo">
8 JavaScript 能改变 HTML 元素的内容。
9 </p>
10
11 <script>
12 function myFunction()
13 {
14 x=document.getElementById("demo"); // 找到元素
15 x.innerHTML="Hello JavaScript!"; // 改变内容
16
17 }
18 </script>
19
20 <button type="button" onclick="myFunction()">点击这里</button>
21
22 </body>
23 </html>
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