 
<script type="text/javascript" src="/editor/fckeditor.js"></script> 
<script type="text/javascript"> 
<!-- 
var oFCKeditor = new FCKeditor( 'Content' ) ; 
oFCKeditor.BasePath = "/editor/" ; 
oFCKeditor.ToolbarSet = "User" ; 
oFCKeditor.Value = '沒有最好，只有更好，大家努力' ; 
oFCKeditor.Height = 450 ; 
oFCKeditor.Width = 660 ; 
oFCKeditor.Create() ; 
//--> 
</script> 
<input type="button" value="檢測字數(shù)(包括HTML代碼)" style="width:165px;" class="inputc" onClick="checklength()"> 
<script> 

//檢測在線編器字符數(shù) ,他必須通過創(chuàng)建FCKeditorAPI來實現(xiàn)，代碼如下。

復制代碼代碼如下:

 
function checklength() 
{ 
var Content; 
var oEditor = FCKeditorAPI.GetInstance('Content') ; 
Content=oEditor.GetXHTML(true) 
alert("n當前: "+Content.length+" 個字符"); 
return false; 
} 
</script> 

再看實例，這里限制了fckeditor編輯器內容的長度哦，

復制代碼代碼如下:

 
window.onload=function(){ 
function FCKeditor_OnComplete() 
{ 
var editor = FCKeditorAPI.GetInstance('info') ; 
editor.Events.AttachEvent('OnSelectionChange', editor_keydown); 
} 
function editor_keydown(editor) 
{ 
var maxLength=3; //最大輸入字數(shù) 
content= $(editor.EditorDocument.body).text(); 
var len= content.length; 
var $info =$('#info');//存放提示信息 
if(len < maxLength){ 
.text("還可以輸入 "+(maxLength-len)+"字"); 
} 
if(len == maxLength){ 
$info.text("字數(shù)達到上限"); 
} 
if(len > maxLength){ 
$info.text(" 輸入字符超過"+maxLength+"個,請更改！"); 
} 
} 
FCKeditor_OnComplete() 
} 