Encoding API 编码

TextDecoder 和 TextDecoderStream 构造函数可以传递一个可选的 label，表示使用的编码。默认是 UTF-8。

以下表格列出了用户代理一定支持的所有编码的名称和 label，这是在编码规范中定义的。这些编码通常适用于需要使用字符编码的任何地方。

Label	编码
"`unicode-1-1-utf-8`"、"`utf-8`"、"`utf8`"	`'utf-8'`
"`866`"、"`cp866`"、"`csibm866`"、"`ibm866`"	`'ibm866'`
"`csisolatin2`"、"`iso-8859-2`"、"`iso-ir-101`"、"`iso8859-2`"、"`iso88592`"、"`iso_8859-2`"、"`iso_8859-2:1987`"、"`l2`"、"`latin2`"	`'iso-8859-2'`
"`csisolatin3`"、"`iso-8859-3`"、"`iso-ir-109`"、"`iso8859-3`"、"`iso88593`"、"`iso_8859-3`"、"`iso_8859-3:1988`"、"`l3`"、"`latin3`"	`'iso-8859-3'`
"`csisolatin4`"、"`iso-8859-4`"、"`iso-ir-110`"、"`iso8859-4`"、"`iso88594`"、"`iso_8859-4`"、"`iso_8859-4:1988`"、"`l4`"、"`latin4`"	`'iso-8859-4'`
"`csisolatincyrillic`"、"`cyrillic`"、"`iso-8859-5`"、"`iso-ir-144`"、"`iso88595`"、"`iso_8859-5`"、"`iso_8859-5:1988`"	`'iso-8859-5'`
"`arabic`"、"`asmo-708`"、"`csiso88596e`"、"`csiso88596i`"、"`csisolatinarabic`"、"`ecma-114`"、"`iso-8859-6`"、"`iso-8859-6-e`"、"`iso-8859-6-i`"、"`iso-ir-127`"、"`iso8859-6`"、"`iso88596`"、"`iso_8859-6`"、"`iso_8859-6:1987`"	`'iso-8859-6'`
"`csisolatingreek`"、"`ecma-118`"、"`elot_928`"、"`greek`"、"`greek8`"、"`iso-8859-7`"、"`iso-ir-126`"、"`iso8859-7`"、"`iso88597`"、"`iso_8859-7`"、"`iso_8859-7:1987`"、"`sun_eu_greek`"	`'iso-8859-7'`
"`csiso88598e`"、"`csisolatinhebrew`"、"`hebrew`"、"`iso-8859-8`"、"`iso-8859-8-e`"、"`iso-ir-138`"、"`iso8859-8`"、"`iso88598`"、"`iso_8859-8`"、"`iso_8859-8:1988`"、"`visual`"	`'iso-8859-8'`
"`csiso88598i`"、"`iso-8859-8-i`"、"`logical`"	`'iso-8859-8i'`
"`csisolatin6`"、"`iso-8859-10`"、"`iso-ir-157`"、"`iso8859-10`"、"`iso885910`"、"`l6`"、"`latin6`"	`'iso-8859-10'`
"`iso-8859-13`"、"`iso8859-13`"、"`iso885913`"	`'iso-8859-13'`
"`iso-8859-14`"、"`iso8859-14`"、"`iso885914`"	`'iso-8859-14'`
"`csisolatin9`"、"`iso-8859-15`"、"`iso8859-15`"、"`iso885915`"、"`l9`"、"`latin9`"	`'iso-8859-15'`
"`iso-8859-16`"	`'iso-8859-16'`
"`cskoi8r`"、"`koi`"、"`koi8`"、"`koi8-r`"、"`koi8_r`"	`'koi8-r'`
"`koi8-u`"	`'koi8-u'`
"`csmacintosh`"、"`mac`"、"`macintosh`"、"`x-mac-roman`"	`'macintosh'`
"`dos-874`"、"`iso-8859-11`"、"`iso8859-11`"、"`iso885911`"、"`tis-620`"、"`windows-874`"	`'windows-874'`
"`cp1250`"、"`windows-1250`"、"`x-cp1250`"	`'windows-1250'`
"`cp1251`"、"`windows-1251`"、"`x-cp1251`"	`'windows-1251'`
"`ansi_x3.4-1968`"、"`ascii`"、"`cp1252`"、"`cp819`"、"`csisolatin1`"、"`ibm819`"、"`iso-8859-1`"、"`iso-ir-100`"、"`iso8859-1`"、"`iso88591`"、"`iso_8859-1`"、"`iso_8859-1:1987`"、"`l1`"、"`latin1`"、"`us-ascii`"、"`windows-1252`"、"`x-cp1252`"	`'windows-1252'`
"`cp1253`"、"`windows-1253`"、"`x-cp1253`"	`'windows-1253'`
"`cp1254`"、"`csisolatin5`"、"`iso-8859-9`"、"`iso-ir-148`"、"`iso8859-9`"、"`iso88599`"、"`iso_8859-9`"、"`iso_8859-9:1989`"、"`l5`"、"`latin5`"、"`windows-1254`"、"`x-cp1254`"	`'windows-1254'`
"`cp1255`"、"`windows-1255`"、"`x-cp1255`"	`'windows-1255'`
"`cp1256`"、"`windows-1256`"、"`x-cp1256`"	`'windows-1256'`
"`cp1257`"、"`windows-1257`"、"`x-cp1257`"	`'windows-1257'`
"`cp1258`"、"`windows-1258`"、"`x-cp1258`"	`'windows-1258'`
"`x-mac-cyrillic`"、"`x-mac-ukrainian`"	`'x-mac-cyrillic'`
"`chinese`"、"`csgb2312`"、"`csiso58gb231280`"、"`gb2312`"、"`gb_2312`"、"`gb_2312-80`"、"`gbk`"、"`iso-ir-58`"、"`x-gbk`"	`'gbk'`
"`gb18030`"	`'gb18030'`
"`hz-gb-2312`"	`'hz-gb-2312'`
"`big5`"、"`big5-hkscs`"、"`cn-big5`"、"`csbig5`"、"`x-x-big5`"	`'big5'`
"`cseucpkdfmtjapanese`"、"`euc-jp`"、"`x-euc-jp`"	`'euc-jp'`
"`csiso2022jp`"、"`iso-2022-jp`"	`'iso-2022-jp'`
"`csshiftjis`"、"`ms_kanji`"、"`shift-jis`"、"`shift_jis`"、"`sjis`"、"`windows-31j`"、"`x-sjis`"	`'shift-jis'`
"`cseuckr`"、"`csksc56011987`"、"`euc-kr`"、"`iso-ir-149`"、"`korean`"、"`ks_c_5601-1987`"、"`ks_c_5601-1989`"、"`ksc5601`"、"`ksc_5601`"、"`windows-949`"	`'euc-kr'`
"`csiso2022kr`"、"`iso-2022-kr`"	`'iso-2022-kr'`
"`utf-16be`"	`'utf-16be'`
"`utf-16`"、"`utf-16le`"	`'utf-16le'`
"`x-user-defined`"	`'x-user-defined'`
"`iso-2022-cn`"、"`iso-2022-cn-ext`"	`'replacement'`