试试我发的这个是不是楼主,你想要的?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>多选框</title> <script> function $A(name){return document.getElementsByName(name);} window.onload=function(){ /** * 复选框限制 * @param {Object} name 复选框的name * @param {Object} maxck 最多复选个数 */ function checks(name,maxck){ var cks = $A(name); function check(){ var t=0; for(i=0;i<cks.length;i++){ if(cks[i].checked){t++;} if(t>maxck){return false;} } return true; } for(i=0;i<cks.length;i++){ cks[i].onclick=function(){ if(!check()){ alert("最多选择"+maxck+"个"); this.checked=false; } } } } checks("cd1",4); //return true; } </script> </head> <body> <form name="form1" method="post" > 对这个限制4个选择<br> <input type="CHECKBOX" name="cd1" value="A">A <input type="CHECKBOX" name="cd1" value="B">B <input type="CHECKBOX" name="cd1" value="C">C <input type="CHECKBOX" name="cd1" value="D">D <input type="CHECKBOX" name="cd1" value="E">E <input type="CHECKBOX" name="cd1" value="F">F <input type="CHECKBOX" name="cd1" value="G">G <input type="CHECKBOX" name="cd1" value="H">H <input type="CHECKBOX" name="cd1" value="I">I <input type="CHECKBOX" name="cd1" value="J">J <br> </form> </body> </html>
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