JS对字符串字节长度处理：

String.prototype.gblen = function () {

    var len = 0;

    for (var i = 0; i < this.length; i++) {

        if (this.charCodeAt(i) > 127 || this.charCodeAt(i) == 94) {

            len += 2;

        } else {

            len++;

        }

    }

    return len;

}

String.prototype.gbtrim = function (len, s) {

    var str = '';

    var sp = s || '';

    var len2 = 0;

    for (var i = 0; i < this.length; i++) {

        if (this.charCodeAt(i) > 127 || this.charCodeAt(i) == 94) {

            len2 += 2;

        } else {

            len2++;

        }

    }

    if (len2 <= len) {

        return this;

    }

    len2 = 0;

    len = (len > sp.length) ? len - sp.length : len;

    for (var i = 0; i < this.length; i++) {

        if (this.charCodeAt(i) > 127 || this.charCodeAt(i) == 94) {

            len2 += 2;

        } else {

            len2++;

        }

        if (len2 > len) {

            str += sp;

            break;

        }

        str += this.charAt(i);

    }

    return str;

}

 

C#判断字节长度处理：

  if (System.Text.Encoding.Default.GetByteCount(member.NICK) > 20 || System.Text.Encoding.Default.GetByteCount(member.NICK)<2) { sysResult = new SysResult("-1", "昵称的字符长度必须为2-20字节"); return Json(sysResult); }