用开源的好点，自己做也行。

1、前后端对字符长度的限制，文件大小的控制，检测是否恶意代码等等

2、对提交的数据做字符过滤，比如将英文 < 替换成 中文＜

3、转义接口返回的数据

4、对文本编辑的内容，验证上传文件的格式，大小

5、过滤掉敏感字符，XSS这类的

比较炫的文本编辑用JQuery这类插件就行，但是要对上传的文本文件做一些安全的处理，实现起来功能比较多。。。

1、先聊聊安全性，使用富文本获得数据后必然是需要过滤随后插入数据库内。我的做法是把敏感标签类似 '<' '>' 全部转换成 '[' ']' 这样再怎么注入也无计可施了。
2、性能问题我主要建议你在数据库字段设计上，不要使用text，要选择varchar

想在前端做过滤，建议是用 xss.js，不用自己写过滤，毕竟术业有专攻。

但是，为了性能考虑，还是建议在后端做过滤，后端肯定也有许多过滤 xss 攻击的工具

我看到网上有两种解决方案:

<?php
function RemoveXSS($val) {  
   // remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed  
   // this prevents some character re-spacing such as <java\0script>  
   // note that you have to handle splits with \n, \r, and \t later since they *are* allowed in some inputs  
   $val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $val);  
     
   // straight replacements, the user should never need these since they're normal characters  
   // this prevents like <IMG SRC=@avascript:alert('XSS')>  
   $search = 'abcdefghijklmnopqrstuvwxyz'; 
   $search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';  
   $search .= '1234567890!@#$%^&*()'; 
   $search .= '~`";:?+/={}[]-_|\'\\'; 
   for ($i = 0; $i < strlen($search); $i++) { 
      // ;? matches the ;, which is optional 
      // 0{0,7} matches any padded zeros, which are optional and go up to 8 chars 
    
      // @ @ search for the hex values 
      $val = preg_replace('/(&#[xX]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); // with a ; 
      // @ @ 0{0,7} matches '0' zero to seven times  
      $val = preg_replace('/(&#0{0,8}'.ord($search[$i]).';?)/', $search[$i], $val); // with a ; 
   } 
    
   // now the only remaining whitespace attacks are \t, \n, and \r 
   $ra1 = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base'); 
   $ra2 = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload'); 
   $ra = array_merge($ra1, $ra2); 
    
   $found = true; // keep replacing as long as the previous round replaced something 
   while ($found == true) { 
      $val_before = $val; 
      for ($i = 0; $i < sizeof($ra); $i++) { 
         $pattern = '/'; 
         for ($j = 0; $j < strlen($ra[$i]); $j++) { 
            if ($j > 0) { 
               $pattern .= '(';  
               $pattern .= '(&#[xX]0{0,8}([9ab]);)'; 
               $pattern .= '|';  
               $pattern .= '|(&#0{0,8}([9|10|13]);)'; 
               $pattern .= ')*'; 
            } 
            $pattern .= $ra[$i][$j]; 
         } 
         $pattern .= '/i';  
         $replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2); // add in <> to nerf the tag  
         $val = preg_replace($pattern, $replacement, $val); // filter out the hex tags  
         if ($val_before == $val) {  
            // no replacements were made, so exit the loop  
            $found = false;  
         }  
      }  
   }  
   return $val;  
}   
?>

第二种使用htmlpurifier组件

function removeXSS($data)
{
    require_once './HtmlPurifier/HTMLPurifier.auto.php';
    $_clean_xss_config = HTMLPurifier_Config::createDefault();
    $_clean_xss_config->set('Core.Encoding', 'UTF-8');
    // 设置保留的标签
    $_clean_xss_config->set('HTML.Allowed','div,b,strong,i,em,a[href|title],ul,ol,li,p[style],br,span[style],img[width|height|alt|src]');
    $_clean_xss_config->set('CSS.AllowedProperties', 'font,font-size,font-weight,font-style,font-family,text-decoration,padding-left,color,background-color,text-align');
    $_clean_xss_config->set('HTML.TargetBlank', TRUE);
    $_clean_xss_obj = new HTMLPurifier($_clean_xss_config);
    // 执行过滤
    return $_clean_xss_obj->purify($data);
}

哪一种更好一点.
第一种有点看不太懂

用源码开放的呗，他没有远程的请求，就没事。推荐wangEdit，比百度的轻便，问题也很快就得到解决。