<form name=”myform” action=”” method=”” onsubmit=”return check()”> <input type=”radio” name=”picno” value=”1″>选择1 <input type=”radio” name=”picno” value=”2″>选择2 <input type=”radio” name=”picno” value=”3″>选择3 <input type=”submit” value=”Submit”> <input type=”reset” value=”Reset”> </form> <script language=”JavaScript”> function check(){ var flag=0; for(i=0;i<myform.picno.length;i++) if(myform.picno[i].checked==true){ flag=1; break; } if(!flag){ alert(“请先选择!”); return false; } } </script> Read More>