js判断FCKeditor内容是否为空的两种形式

形式1：

function checkFCK(key) 
{ 
var oEditor=FCKeditorAPI.GetInstance(key); 
var content=oEditor.GetXHTML(true); 
content=content.replace(/　/g,""); 
content=content.replace(/\s/g,""); 
content=content.replace(/ /g,""); 
content=content.replace(/<br\/>/g,""); 
content=content.replace(/<p><\/p>/g,""); 
content=content.replace(/<div><\/div>/g,""); 
if(content==null||content==""){ 
oEditor.SetHTML(""); 
return false; 
} 
return true; 
}

形式2：

function GetMessageLength(str) 
{ 
var oEditor = FCKeditorAPI.GetInstance(str) ; 
var oDOM = oEditor.EditorDocument ; 
var iLength ; 
if ( document.all ) // If Internet Explorer. 
{ 
iLength = oDOM.body.innerText.length ; 
} 
else // If Gecko. 
{ 
var r = oDOM.createRange() ; 
r.selectNodeContents( oDOM.body ) ; 
iLength = r.toString().length ; 
} 
return iLength 
}