JavaScript code
var oEditor = FCKeditorAPI.GetInstance('ContentPlaceHolder1_FCKeditor1');
var fckText = oEditor.GetXHTML(true);
var fckLength = fckText.length;
fckLength 输入的字符数
fckText 为输入的文本
ContentPlaceHolder1_FCKeditor1 为你在页面上生成的ID