减小字体 增大字体
] 源码如下<br>----------------------------------------------------------<br><html><br><head><br><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><br><title>html－www.51<a target="_blank" href="http://www.newasp.cn/" class="wordstyle">windows</a>.Net</title><br></head><br><body><br><SCRIPT LANGUAGE="JavaScript"><br>function check(form) {<br>var checkit = false<br>for (var i=0;i<form.sel.length;i++) {<br>if (form.sel[i].checked) {checkit=true;break}<br>}<br>if (checkit) {return true} else {alert("please select one");return false}<br>}<br></SCRIPT><br><form name="form1" onsubmit="return check(this)"><br><input name="sel" type="radio" value="selA">A<br><input name="sel" type="radio" value="selB">B<br><input name="sel" type="radio" value="selC">C<br><INPUT TYPE="submit" VALUE="submit"><br></form><br><br></body><br></html> <br>
[提示：你可先按照下面代码提示修改 上面部分代码，再按运行，此处看到的演示不完全正确]
减小字体
增大字体
