ckeditor字數限制

var maxlength = 200;
   _editor=CKEDITOR.replace("ckeditor",{height:'130px'});
   _editor.on('key',function(event){
		var oldhtml = _editor.document.getBody().getHtml();
		var description = oldhtml.replace(/<.*?>/ig,"");
		var etop = $("#cke_1_top");
		var _slen = maxlength-description.length;
		var canwrite = $("<label id='canwrite'>還可以輸入200字</label>");
		if(etop.find("#canwrite").length<1){
			canwrite.css({border:'1px #f1f1f1 solid','line-height':'28px',color:'#999'});
			etop.prepend(canwrite);
		}
		var _label = etop.find("#canwrite");
		if(description.length>maxlength){
			//alert("最多可以輸入"+maxlength+"個文字，您已達到最大字數限制");
			_editor.setData(oldhtml);
			_label.html("還可以輸入0字");
		}else{
			_label.html("還可以輸入"+_slen+"字");
		}
	});