处理字符串（正则）保留汉字

[javascript]代码库

  //用户名验证
function checkName(name, url, oper, show_id) {
	//alert(1);
	if(!checkCustName(name,show_id)) {		 
		return false;
	}
	Ext.Ajax.request({
				url : url,
				params : {
					oper : oper,
					name : name
				},
				success : function(response) {
					var res = response.responseText;
					var ress=res.replace(/[^\u4E00-\u9FA5]/g,'');
					alert(ress);
					//var reg = /color\=\"green\"/;
					//hideBgImg(show_id, reg.test(res));
					//Ext.get(show_id).update(response.responseText);
					return true;
				},
				failure : function(response) {
				 
				 
					return false;
				}
			});
}
//var ress=res.replace(/[^\u4E00-\u9FA5]/g,'');