//UTF-8字节数组转字符串    
　　　　function utf8ByteToUnicodeStr(utf8Bytes) {
        var unicodeStr = "";
        for (var pos = 0; pos < utf8Bytes.length;) {
            var flag = utf8Bytes[pos];
            var unicode = 0;
            if ((flag >>> 7) === 0) {
                unicodeStr += String.fromCharCode(utf8Bytes[pos]);
                pos += 1;

            } else if ((flag & 0xFC) === 0xFC) {
                unicode = (utf8Bytes[pos] & 0x3) << 30;
                unicode |= (utf8Bytes[pos + 1] & 0x3F) << 24;
                unicode |= (utf8Bytes[pos + 2] & 0x3F) << 18;
                unicode |= (utf8Bytes[pos + 3] & 0x3F) << 12;
                unicode |= (utf8Bytes[pos + 4] & 0x3F) << 6;
                unicode |= (utf8Bytes[pos + 5] & 0x3F);
                unicodeStr += String.fromCodePoint(unicode);
                pos += 6;

            } else if ((flag & 0xF8) === 0xF8) {
                unicode = (utf8Bytes[pos] & 0x7) << 24;
                unicode |= (utf8Bytes[pos + 1] & 0x3F) << 18;
                unicode |= (utf8Bytes[pos + 2] & 0x3F) << 12;
                unicode |= (utf8Bytes[pos + 3] & 0x3F) << 6;
                unicode |= (utf8Bytes[pos + 4] & 0x3F);
                unicodeStr += String.fromCodePoint(unicode);
                pos += 5;

            } else if ((flag & 0xF0) === 0xF0) {
                unicode = (utf8Bytes[pos] & 0xF) << 18;
                unicode |= (utf8Bytes[pos + 1] & 0x3F) << 12;
                unicode |= (utf8Bytes[pos + 2] & 0x3F) << 6;
                unicode |= (utf8Bytes[pos + 3] & 0x3F);
                unicodeStr += String.fromCodePoint(unicode);
                pos += 4;

            } else if ((flag & 0xE0) === 0xE0) {
                unicode = (utf8Bytes[pos] & 0x1F) << 12;;
                unicode |= (utf8Bytes[pos + 1] & 0x3F) << 6;
                unicode |= (utf8Bytes[pos + 2] & 0x3F);
                unicodeStr += String.fromCharCode(unicode);
                pos += 3;

            } else if ((flag & 0xC0) === 0xC0) { //110
                unicode = (utf8Bytes[pos] & 0x3F) << 6;
                unicode |= (utf8Bytes[pos + 1] & 0x3F);
                unicodeStr += String.fromCharCode(unicode);
                pos += 2;

            } else {
                unicodeStr += String.fromCharCode(utf8Bytes[pos]);
                pos += 1;
            }
        }
        return unicodeStr;
    }