js javascript UTF-8 GB2312编码转换

在用js做项目时，接收方需要使用GB2312汉字编码，发送方使用UTF-8汉字编码。

这里要做汉字编码转换。

在网上找了一个下午，没有找到通用的方法，只能自己做一个汉字编码对应表。

关键是要自己做一个汉字编码对应表

先按键GB2312汉字的编码顺序生成表，然后生成表GB2312表转向成UTF-8、UCS2-BigEndian,UCS-LittleEndian表。所以同一个位置是同一个汉字的编码。

var _GB2312_1_87=[0xA1A1,0xA1A2,... 	//SECTOR ];var _UTF8_1_87=[0xE38080,0xE38081, ... 	//SECTOR ];var _UCS2_Big_1_87=[0x300,0x301,... 	//SECTOR ];var _UCS2_Little_1_87=0x030,0x130,... 	//SECTOR ];

有了编码表，可以直接查表:

///大小头交换(高8位和低8位交换)function ConvetEndian(uincodeLE) {	//高8位和低8位互换		var tmp1 = 0,tmp2 = 0,tmp3 = 0;	tmp1 = (uincodeLE & 0x00FF);	tmp2 = uincodeLE >> 8;	tmp3 = tmp2 | (tmp1 << 8);	return tmp3;}function GB2312_TO_Unicode(gcode) {	for (var i = 0; i < 7614; i  ) {		if (gcode == _GB2312_1_87[i]) {			return _UCS2_Big_1_87[i];		}	}	return -1;}function Unicode_TO_GB2312(ucode) {	for (var i = 0; i < 7614; i  ) {		if (ucode == _UCS2_Big_1_87[i]) {			return _GB2312_1_87[i];		}	}	return -1；}//将不长数据转换为UNICODE,最长6个字节。返回转换结果，失败返回-1function utf8ToUnicode(indata) {	/*UTF-8编码方式	 * 0000 0000 - 0000 007F | 00 0XXXXXXX	 * 0000 0080 - 0000 07FF | C0 110XXXXX 10XXXXXX	 * 0000 0800 - 0000 FFFF | E0 1110XXXX 10XXXXXX 10XXXXXX	 * 0001 0000 - 001F FFFF | F0 11110XXX 10XXXXXX 10XXXXXX 10XXXXXX	 * 0020 0000 - 03FF FFFF | F8 111110XX 10XXXXXX 10XXXXXX 10XXXXXX 10XXXXXX	 * 0400 0000 - 7FFF FFFF | FC 1111110X 10XXXXXX 10XXXXXX 10XXXXXX 10XXXXXX 10XXXXXX	 */	var hbs = indata[0];	var dcode = 0;	var dcnt = 0;	//先看第一个字节，有多少个字节的有效数据，同时取得第一个字节的有效数据	if (hbs > 0xFE) //超标，不能转换	{		return -1;	}	else if (hbs >= 0xFC) // 6	{		dcnt = 6;		dcode |= (hbs & 0x01);	}	else if (hbs >= 0xF8) // 5	{		dcnt = 5;		dcode |= (hbs & 0x03);	}	else if (hbs >= 0xF0) // 4	{		dcnt = 4;		dcode |= (hbs & 0x07);	}	else if (hbs >= 0xE0) // 3	{		dcnt = 3;		dcode |= (hbs & 0x0F);	}	else if (hbs >= 0xC0) // 2	{		dcnt = 2;		dcode |= (hbs & 0x1F);	}	else {		dcnt = 1;	}	if (dcnt == 1) {		return indata[0];	}	for (var i = 1; i < dcnt; i  ) {		dcode <<=                 bit给新数据		dcode |= (indata[i] & 0x3F); ///获取新数据的低位6bit	}	return dcode;}//最大16位unicode编码转换成utf8function Unicode_TO_UTF8(code) {	/*UTF-8编码方式	 * 0000 0000 - 0000 007F | 0XXXXXXX	 * 0000 0080 - 0000 07FF | 110XXXXX 10XXXXXX	 * 0000 0800 - 0000 FFFF | 1110XXXX 10XXXXXX 10XXXXXX	 * 0001 0000 - 001F FFFF | 11110XXX 10XXXXXX 10XXXXXX 10XXXXXX	 * 0020 0000 - 03FF FFFF | 111110XX 10XXXXXX 10XXXXXX 10XXXXXX 10XXXXXX	 * 0400 0000 - 7FFF FFFF | 1111110X 10XXXXXX 10XXXXXX 10XXXXXX 10XXXXXX 10XXXXXX	 */	var out = [0];	var bCnt = -1;	if (code > 0x7FFFFFFF) //太大放不下了	{		bCnt = -1;		return -1;	}	else if (code > 0x03FFFFFF) // 6个字节,0400 0000 - 7FFF FFFF	{		bCnt = 6;	}	else if (code > 0x001FFFFF) // 5个字节	{		bCnt = 5;	}	else if (code > 0x0000FFFF) // 4个字节	{		bCnt = 4;	}	else if (code > 0x000007FF) // 3个字节	{		bCnt = 3;	}	else if (code > 0x0000007F) // 2个字节	{		bCnt = 2;	}	else // 1个字节	{		bCnt = 1;	}	if (bCnt == 1) {		out[0] = code;		return bCnt;	}	var hbs = 0x80; //首字节高位	var utf8Code = 0;	//    qDebug("codeIn:%x",code);	for (var i = 0; i < (bCnt - 1); i  ) {		out[bCnt - i - 1] = 0x80 | (code & 0x3f); //取最后6Bits		code >>= 6;                               //丢掉6Bits		hbs >>= 1;		hbs |= 0x80; //首字节高位多一个“1”	}	out[0] = hbs | code; //首字节	for (var i = 0; i < bCnt; i  ) {		utf8Code <<= 8;		utf8Code |= out[i];	}	return utf8Code;}function TextCodec(codeType,';					}				}				else if (targetC';					}				}				else if (targetCode & 0xff00)//2bytes				{					for (var k = 1; k >= 0; k--) {						var _byte = (targetCode >> (8 * k)) & 0xff;						OutputStr += '0x' + _byte.toString(16).toUpperCase() + ',';					}				}				else //1byte				{					var _byte = targetCode;					OutputStr += '0x' + _byte.toString(16).toUpperCase() + ',';				}				OutputStr += "//" + inputChar + " " + codeType + "\n";				break;			case 'long':				OutputStr += '0x' + targetCode.toString(16).toUpperCase() + ',' + "//" + inputChar + " " + codeType + "\n";				break;			default:				OutputStr += '0x' + targetCode.toString(16).toUpperCase() + ',' + "//" + inputChar + " " + codeType + "\n";				break;		}	}	return OutputStr;};

运行：TextCodec("GB2312","long","输入要转换的中文abc");结果：  0xCAE4,//输 GB2312  0xC8EB,//入 GB2312  0xD2AA,//要 GB2312  0xD7AA,//转 GB2312  0xBBBB,//换 GB2312  0xB5C4,//的 GB2312  0xD6D0,//中 GB2312  0xCEC4,//文 GB2312  0x61,//a GB2312  0x62,//b GB2312  0x63,//c GB2312

完整的编码表，每个表有7614个编码.

var _GB2312_1_87 = [ //GB2312字库开始	0xA1A1, 0xA1A2, 0xA1A3, 0xA1A4, 0xA1A5, 0xA1A6, 0xA1A7, 0xA1A8, 0xA1A9, 0xA1AA, 0xA1AB, 0xA1AC, 0xA1AD, 0xA1AE, 0xA1AF, 	//第1区: A1A0 : 　,、,。,·,ˉ,ˇ,¨,〃,々,—,～,‖,…,‘,’, 	0xA1B0, 0xA1B1, 0xA1B2, 0xA1B3, 0xA1B4, 0xA1B5, 0xA1B6, 0xA1B7, 0xA1B8, 0xA1B9, 0xA1BA, 0xA1BB, 0xA1BC, 0xA1BD, 0xA1BE, 0xA1BF, 	//第1区: A1B0 : “,”,〔,〕,〈,〉,《,》,「,」,『,』,〖,〗,【,】, 	0xA1C0, 0xA1C1, 0xA1C2, 0xA1C3, 0xA1C4, 0xA1C5, 0xA1C6, 0xA1C7, 0xA1C8, 0xA1C9, 0xA1CA, 0xA1CB, 0xA1CC, 0xA1CD, 0xA1CE, 0xA1CF, 	//第1区: A1C0 : ±,×,÷,∶,∧,∨,∑,∏,∪,∩,∈,∷,√,⊥,∥,∠, 	0xA1D0, 0xA1D1, 0xA1D2, 0xA1D3, 0xA1D4, 0xA1D5, 0xA1D6, 0xA1D7, 0xA1D8, 0xA1D9, 0xA1DA, 0xA1DB, 0xA1DC, 0xA1DD, 0xA1DE, 0xA1DF, 	//第1区: A1D0 : ⌒,⊙,∫,∮,≡,≌,≈,∽,∝,≠,≮,≯,≤,≥,∞,∵, 	0xA1E0, 0xA1E1, 0xA1E2, 0xA1E3, 0xA1E4, 0xA1E5, 0xA1E6, 0xA1E7, 0xA1E8, 0xA1E9, 0xA1EA, 0xA1EB, 0xA1EC, 0xA1ED, 0xA1EE, 0xA1EF, 	//第1区: A1E0 : ∴,♂,♀,°,′,″,℃,＄,¤,￠,￡,‰,§,№,☆,★, 	0xA1F0, 0xA1F1, 0xA1F2, 0xA1F3, 0xA1F4, 0xA1F5, 0xA1F6, 0xA1F7, 0xA1F8, 0xA1F9, 0xA1FA, 0xA1FB, 0xA1FC, 0xA1FD, 0xA1FE, 	//第1区: A1F0 : ○,●,◎,◇,◆,□,■,△,▲,※,→,←,↑,↓,〓, 	0xA2A1, 0xA2A2, 0xA2A3, 0xA2A4, 0xA2A5, 0xA2A6, 0xA2A7, 0xA2A8, 0xA2A9, 0xA2AA, 0xA2AB, 0xA2AC, 0xA2AD, 0xA2AE, 0xA2AF, 	//第2区: A2A0 : ⅰ,ⅱ,ⅲ,ⅳ,ⅴ,ⅵ,ⅶ,ⅷ,ⅸ,ⅹ,,,,,, 	0xA2B0, 0xA2B1, 0xA2B2, 0xA2B3, 0xA2B4, 0xA2B5, 0xA2B6, 0xA2B7, 0xA2B8, 0xA2B9, 0xA2BA, 0xA2BB, 0xA2BC, 0xA2BD, 0xA2BE, 0xA2BF, 	//第2区: A2B0 : ,⒈,⒉,⒊,⒋,⒌,⒍,⒎,⒏,⒐,⒑,⒒,⒓,⒔,⒕,⒖, 	0xA2C0, 0xA2C1, 0xA2C2, 0xA2C3, 0xA2C4, 0xA2C5, 0xA2C6, 0xA2C7, 0xA2C8, 0xA2C9, 0xA2CA, 0xA2CB, 0xA2CC, 0xA2CD, 0xA2CE, 0xA2CF, 	//第2区: A2C0 : ⒗,⒘,⒙,⒚,⒛,⑴,⑵,⑶,⑷,⑸,⑹,⑺,⑻,⑼,⑽,⑾, 	0xA2D0, 0xA2D1, 0xA2D2, 0xA2D3, 0xA2D4, 0xA2D5, 0xA2D6, 0xA2D7, 0xA2D8, 0xA2D9, 0xA2DA, 0xA2DB, 0xA2DC, 0xA2DD, 0xA2DE, 0xA2DF, 	//第2区: A2D0 : ⑿,⒀,⒁,⒂,⒃,⒄,⒅,⒆,⒇,①,②,③,④,⑤,⑥,⑦, 	0xA2E0, 0xA2E1, 0xA2E2, 0xA2E3, 0xA2E4, 0xA2E5, 0xA2E6, 0xA2E7, 0xA2E8, 0xA2E9, 0xA2EA, 0xA2EB, 0xA2EC, 0xA2ED, 0xA2EE, 0xA2EF, 	//第2区: A2E0 : ⑧,⑨,⑩,€,,㈠,㈡,㈢,㈣,㈤,㈥,㈦,㈧,㈨,㈩,, 	0xA2F0, 0xA2F1, 0xA2F2, 0xA2F3, 0xA2F4, 0xA2F5, 0xA2F6, 0xA2F7, 0xA2F8, 0xA2F9, 0xA2FA, 0xA2FB, 0xA2FC, 0xA2FD, 0xA2FE, 	//第2区: A2F0 : ,Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅴ,Ⅵ,Ⅶ,Ⅷ,Ⅸ,Ⅹ,Ⅺ,Ⅻ,,, 	0xA3A1, 0xA3A2, 0xA3A3, 0xA3A4, 0xA3A5, 0xA3A6, 0xA3A7, 0xA3A8, 0xA3A9, 0xA3AA, 0xA3AB, 0xA3AC, 0xA3AD, 0xA3AE, 0xA3AF, 	//第3区: A3A0 : ！,＂,＃,￥,％,＆,＇,（,）,＊,＋,，,－,．,／, 	0xA3B0, 0xA3B1, 0xA3B2, 0xA3B3, 0xA3B4, 0xA3B5, 0xA3B6, 0xA3B7, 0xA3B8, 0xA3B9, 0xA3BA, 0xA3BB, 0xA3BC, 0xA3BD, 0xA3BE, 0xA3BF, 	//第3区: A3B0 : ０,１,２,３,４,５,６,７,８,９,：,；,＜,＝,＞,？, 	0xA3C0, 0xA3C1, 0xA3C2, 0xA3C3, 0xA3C4, 0xA3C5, 0xA3C6, 0xA3C7, 0xA3C8, 0xA3C9, 0xA3CA, 0xA3CB, 0xA3CC, 0xA3CD, 0xA3CE, 0xA3CF, 	//第3区: A3C0 : ＠,Ａ,Ｂ,Ｃ,Ｄ,Ｅ,Ｆ,Ｇ,Ｈ,Ｉ,Ｊ,Ｋ,Ｌ,Ｍ,Ｎ,Ｏ, 	0xA3D0, 0xA3D1, 0xA3D2, 0xA3D3, 0xA3D4, 0xA3D5, 0xA3D6, 0xA3D7, 0xA3D8, 0xA3D9, 0xA3DA, 0xA3DB, 0xA3DC, 0xA3DD, 0xA3DE, 0xA3DF, 	//第3区: A3D0 : Ｐ,Ｑ,Ｒ,Ｓ,Ｔ,Ｕ,Ｖ,Ｗ,Ｘ,Ｙ,Ｚ,［,＼,］,＾,＿, 	0xA3E0, 0xA3E1, 0xA3E2, 0xA3E3, 0xA3E4, 0xA3E5, 0xA3E6, 0xA3E7, 0xA3E8, 0xA3E9, 0xA3EA, 0xA3EB, 0xA3EC, 0xA3ED, 0xA3EE, 0xA3EF, 	//第3区: A3E0 : ｀,ａ,ｂ,ｃ,ｄ,ｅ,ｆ,ｇ,ｈ,ｉ,ｊ,ｋ,ｌ,ｍ,ｎ,ｏ, 	0xA3F0, 0xA3F1, 0xA3F2, 0xA3F3, 0xA3F4, 0xA3F5, 0xA3F6, 0xA3F7, 0xA3F8, 0xA3F9, 0xA3FA, 0xA3FB, 0xA3FC, 0xA3FD, 0xA3FE, 	//第3区: A3F0 : ｐ,ｑ,ｒ,ｓ,ｔ,ｕ,ｖ,ｗ,ｘ,ｙ,ｚ,｛,｜,｝,￣, 	0xA4A1, 0xA4A2, 0xA4A3, 0xA4A4, 0xA4A5, 0xA4A6, 0xA4A7, 0xA4A8, 0xA4A9, 0xA4AA, 0xA4AB, 0xA4AC, 0xA4AD, 0xA4AE, 0xA4AF, 	//第4区: A4A0 : ぁ,あ,ぃ,い,ぅ,う,ぇ,え,ぉ,お,か,が,き,ぎ,く, 	0xA4B0, 0xA4B1, 0xA4B2, 0xA4B3, 0xA4B4, 0xA4B5, 0xA4B6, 0xA4B7, 0xA4B8, 0xA4B9, 0xA4BA, 0xA4BB, 0xA4BC, 0xA4BD, 0xA4BE, 0xA4BF, 	//第4区: A4B0 : ぐ,け,げ,こ,ご,さ,ざ,し,じ,す,ず,せ,ぜ,そ,ぞ,た, 	0xA4C0, 0xA4C1, 0xA4C2, 0xA4C3, 0xA4C4, 0xA4C5, 0xA4C6, 0xA4C7, 0xA4C8, 0xA4C9, 0xA4CA, 0xA4CB, 0xA4CC, 0xA4CD, 0xA4CE, 0xA4CF, 	//第4区: A4C0 : だ,ち,ぢ,っ,つ,づ,て,で,と,ど,な,に,ぬ,ね,の,は, 	0xA4D0, 0xA4D1, 0xA4D2, 0xA4D3, 0xA4D4, 0xA4D5, 0xA4D6, 0xA4D7, 0xA4D8, 0xA4D9, 0xA4DA, 0xA4DB, 0xA4DC, 0xA4DD, 0xA4DE, 0xA4DF, 	//第4区: A4D0 : ば,ぱ,ひ,び,ぴ,ふ,ぶ,ぷ,へ,べ,ぺ,ほ,ぼ,ぽ,ま,み, 	0xA4E0, 0xA4E1, 0xA4E2, 0xA4E3, 0xA4E4, 0xA4E5, 0xA4E6, 0xA4E7, 0xA4E8, 0xA4E9, 0xA4EA, 0xA4EB, 0xA4EC, 0xA4ED, 0xA4EE, 0xA4EF, 	//第4区: A4E0 : む,め,も,ゃ,や,ゅ,ゆ,ょ,よ,ら,り,る,れ,ろ,ゎ,わ, 	0xA4F0, 0xA4F1, 0xA4F2, 0xA4F3, 0xA4F4, 0xA4F5, 0xA4F6, 0xA4F7, 0xA4F8, 0xA4F9, 0xA4FA, 0xA4FB, 0xA4FC, 0xA4FD, 0xA4FE, 	//第4区: A4F0 : ゐ,ゑ,を,ん,,,,,,,,,,,, 	0xA5A1, 0xA5A2, 0xA5A3, 0xA5A4, 0xA5A5, 0xA5A6, 0xA5A7, 0xA5A8, 0xA5A9, 0xA5AA, 0xA5AB, 0xA5AC, 0xA5AD, 0xA5AE, 0xA5AF, 	//第5区: A5A0 : ァ,ア,ィ,イ,ゥ,ウ,ェ,エ,ォ,オ,カ,ガ,キ,ギ,ク, 	0xA5B0, 0xA5B1, 0xA5B2, 0xA5B3, 0xA5B4, 0xA5B5, 0xA5B6, 0xA5B7, 0xA5B8, 0xA5B9, 0xA5BA, 0xA5BB, 0xA5BC, 0xA5BD, 0xA5BE, 0xA5BF, 	//第5区: A5B0 : グ,ケ,ゲ,コ,ゴ,サ,ザ,シ,ジ,ス,ズ,セ,ゼ,ソ,ゾ,タ, 	0xA5C0, 0xA5C1, 0xA5C2, 0xA5C3, 0xA5C4, 0xA5C5, 0xA5C6, 0xA5C7, 0xA5C8, 0xA5C9, 0xA5CA, 0xA5CB, 0xA5CC, 0xA5CD, 0xA5CE, 0xA5CF, 	//第5区: A5C0 : ダ,チ,ヂ,ッ,ツ,ヅ,テ,デ,ト,ド,ナ,ニ,ヌ,ネ,ノ,ハ, 	0xA5D0, 0xA5D1, 0xA5D2, 0xA5D3, 0xA5D4, 0xA5D5, 0xA5D6, 0xA5D7, 0xA5D8, 0xA5D9, 0xA5DA, 0xA5DB, 0xA5DC, 0xA5DD, 0xA5DE, 0xA5DF, 	//第5区: A5D0 : バ,パ,ヒ,ビ,ピ,フ,ブ,プ,ヘ,ベ,ペ,ホ,ボ,ポ,マ,ミ, 	0xA5E0, 0xA5E1, 0xA5E2, 0xA5E3, 0xA5E4, 0xA5E5, 0xA5E6, 0xA5E7, 0xA5E8, 0xA5E9, 0xA5EA, 0xA5EB, 0xA5EC, 0xA5ED, 0xA5EE, 0xA5EF, 	//第5区: A5E0 : ム,メ,モ,ャ,ヤ,ュ,ユ,ョ,ヨ,ラ,リ,ル,レ,ロ,ヮ,ワ, 	0xA5F0, 0xA5F1, 0xA5F2, 0xA5F3, 0xA5F4, 0xA5F5, 0xA5F6, 0xA5F7, 0xA5F8, 0xA5F9, 0xA5FA, 0xA5FB, 0xA5FC, 0xA5FD, 0xA5FE, 	//第5区: A5F0 : ヰ,ヱ,ヲ,ン,ヴ,ヵ,ヶ,,,,,,,,, 	0xA6A1, 0xA6A2, 0xA6A3, 0xA6A4, 0xA6A5, 0xA6A6, 0xA6A7, 0xA6A8, 0xA6A9, 0xA6AA, 0xA6AB, 0xA6AC, 0xA6AD, 0xA6AE, 0xA6AF, 	//第6区: A6A0 : Α,Β,Γ,Δ,Ε,Ζ,Η,Θ,Ι,Κ,Λ,Μ,Ν,Ξ,Ο, 	0xA6B0, 0xA6B1, 0xA6B2, 0xA6B3, 0xA6B4, 0xA6B5, 0xA6B6, 0xA6B7, 0xA6B8, 0xA6B9, 0xA6BA, 0xA6BB, 0xA6BC, 0xA6BD, 0xA6BE, 0xA6BF, 	//第6区: A6B0 : Π,Ρ,Σ,Τ,Υ,Φ,Χ,Ψ,Ω,,,,,,,, 	0xA6C0, 0xA6C1, 0xA6C2, 0xA6C3, 0xA6C4, 0xA6C5, 0xA6C6, 0xA6C7, 0xA6C8, 0xA6C9, 0xA6CA, 0xA6CB, 0xA6CC, 0xA6CD, 0xA6CE, 0xA6CF, 	//第6区: A6C0 : ,α,β,γ,δ,ε,ζ,η,θ,ι,κ,λ,μ,ν,ξ,ο, 	0xA6D0, 0xA6D1, 0xA6D2, 0xA6D3, 0xA6D4, 0xA6D5, 0xA6D6, 0xA6D7, 0xA6D8, 0xA6D9, 0xA6DA, 0xA6DB, 0xA6DC, 0xA6DD, 0xA6DE, 0xA6DF, 	//第6区: A6D0 : π,ρ,σ,τ,υ,φ,χ,ψ,ω,,,,,,,, 	0xA6E0, 0xA6E1, 0xA6E2, 0