.net区分中英文截取字符串

 /// <summary>        /// 返回指定长度的字符(区分中英文)        /// </summary>        /// <param name="inputStr">要截取的字符</param>        /// <param name="len">要保留的长度</param>        /// <param name="IsAppendWord">是否附加内容</param>        /// <param name="appendWord">如果IsAppendWord为真，则附加此内容</param>        /// <returns></returns>        private string GetTrimStrWithLenAndCn(string inputStr, int len,bool IsAppendWord,string appendWord )        {            if (string.IsNullOrEmpty(inputStr)) return "";            bool istrim = false;//记录是否截断过            //先截取一次            if (inputStr.Length > len)            {                inputStr = inputStr.Substring(0, len);                istrim = true;            }            //一个中文当两个字符            Regex regcn = new Regex(@"^[\u2E80-\u9FFF]+$");            int nlen = 0;            int n = 0;//计算得出的长度            for (int i = 0; i < inputStr.Length && n<len; i++)            {                if (regcn.IsMatch(inputStr[i].ToString()))                {                    n += 2;                    nlen += 1;//出现次数                }                else                {                    n += 1;                }            }            //出现几次，截取长度应该减几            if (nlen > 0)            {                if (inputStr.Length + nlen > len)                {                    inputStr = inputStr.Substring(0, len-nlen);                    istrim = true;                }            }            if (istrim && IsAppendWord)            {                inputStr += appendWord;            }            return inputStr;        }

JS方法:

/*#########区分中英文截取#########*//*#inputstr:要截取的字符##########*//*#length:要保留的长度#*//*#isAppend:是否附加内容#*//*#appendStr:要附加的内容#*/function TrimStrWithCnAndEn(inputstr, length, isAppend, appendStr) {    if (inputstr == undefined || inputstr == "") {        return "";    }    var istrim = false;//是否截取过    if (inputstr.length > length) {        inputstr = inputstr.substring(0, length);        istrim = true;    }    var reg = /^[\u2E80-\u9FFF]+$/;    var nlen = 0;    var n = 0; //计算得出的长度    for (var i = 0; i < inputstr.length && n < length; i++) {        var ss = inputstr.charAt(i);        var b = reg.test(ss);        if (b)            {                n += 2;                nlen += 1;//出现次数            }            else            {                n += 1;            }        }        //出现几次，截取长度应该减几        if (nlen > 0)        {            if (inputstr.length + nlen > length) {                inputstr = inputstr.substring(0, length - nlen);                istrim = true;            }        }        if (istrim && isAppend)        {            inputstr += appendStr;        }        return inputstr;}