（转载）UBB(JS完整版)

 <SCRIPT language=JavaScript1.2 defer>
function html_trans(str) {
 str = str.replace(//r/g,"");
 str = str.replace(/on(load|click|dbclick|mouseover|mousedown|mouseup)="[^"]+"/ig,"");
 str = str.replace(/<script[^>]*?>([/w/W]*?)<//script>/ig,"");
 str = str.replace(/<style[^>]*?>([/w/W]*?)<//stylet>/ig,"");
 str = str.replace(/<embed[^>]*?>([/w/W]*?)<//embed>/ig,"");
 
 str = str.replace(/<a[^>]+href="([^"]+)"[^>]*>(.*?)<//a>/ig,"[url=$1]$2[/url]");
 str = str.replace(/<font[^>]+color=([^ >]+)[^>]*>(.*?)<//font>/ig,"[color=$1]$2[/color]");
 str = str.replace(/<img[^>]+src="([^"]+)"[^>]*>/ig,"[img]$1[/img]");
 str = str.replace(/<param NAME="Movie" value="([^>"]+/.swf)"[^>]*>/ig,"[flash]$1[/flash]");
 
 str = str.replace(/<([//]?)b>/ig,"[$1b]");
 str = str.replace(/<([//]?)strong>/ig,"[$1b]");
 str = str.replace(/<([//]?)u>/ig,"[$1u]");
 str = str.replace(/<([//]?)i>/ig,"[$1i]");
 
 str = str.replace(/&nbsp;/g," ");
 str = str.replace(/&amp;/g,"&");
 str = str.replace(/&quot;/g,"/"");
 str = str.replace(/&lt;/g,"<");
 str = str.replace(/&gt;/g,">");

        str = str.replace(//[url=([^/]]+)/]/[img/]/g,"[img]");
        str = str.replace(//[//img/]/[//url/]/g,"[/img]");

 str = str.replace(/<br>/ig,"/n");
 str = str.replace(/<[^>]*?>/g,"");

 

 str = str.replace(//n+/g,"/n");
 
 return str;
}

function trans(){
 var str = "";
 rtf.focus();
 rtf.document.body.innerHTML = "";
 rtf.document.execCommand("paste");
 str = rtf.document.body.innerHTML;
 document.all.text2.value=str;
 if(str.length == 0) {
  alert("剪切版不存在超文本数据！");
  return "";
 }
 return html_trans(str);
}

      </SCRIPT> 

<TEXTAREA class=input2 id=text style="WIDTH: 100%; HEIGHT: 200px" rows="1" cols="20"></TEXTAREA><BR>

<IFRAME id=rtf style="WIDTH: 720px; HEIGHT: 100px" marginWidth=0 marginHeight=0
      src="about:blank" scrolling=yes name="I1"></IFRAME>

<INPUT class=input1 onclick="document.getElementById('text').value = trans()" type=button value=转换剪切板数据>