Use gb2312 encoding and decoding in JS

Requirement

Use gb2312 to encode Chinese Characters in Js. For example, "I" should be encoded with "% Ce % D2 ".

 

Analysis

As you know, encodeuri and encodeuricomponent use UTF-8 encoding, for example, "% E6 % 88% 91" after "I" encoding ". According to the experiment, it seems that no parameter specifies the encoding. Only find another method.

There are several solutions as follows:

1. Use js to create a hidden IFRAME and specify it as gb2312 encoding. Put the text to be converted into an input of the IFRAME form, specify form as the get method, and submit it,

Then retrieve the URL and parse it. You can get the encoded text of gb2312.

2. Upload the code to the server using Ajax and then upload it back.

3. Create a gb2312 encoding table in Js.

 

Implementation

The first solution is too difficult for me. I need to test it in multiple different browsers.

The second solution requires the cooperation of servers.

The implementation of the third solution is as follows:

At first, I planned to use arrays to store the encoded table. Later, I used string to store the encoded table to reduce the JS file size.

Therefore, JSCodeAs follows:

 

Code

  Function  Encodetogb2312 (STR ){
  VaR  Strout  =  ""  ;
  For  (  VaR  I  =    0  ; I  <  Str. length; I  ++  ){
  VaR  C  =  Str. charat (I );
  VaR  Code  =  Str. charcodeat (I );
  If  (C  = "     "  ) Strout  + =  "  +  "  ;
  Else     If  (Code  > =     19968     && Code  <=     40869  ){
Index  =  Code  -     19968  ;
Strout  + =     "  %  "    +  Z. substr (Index  *  4  ,  2  )  +     "  %  "     +  Z. substr (Index  *  4  + 2  ,  2  );
}
  Else  {
Strout  + =     "  %  "     +  Str. charcodeat (I). tostring (  16  );
}
}
  Return Strout;
}
  Function  Decodefromgb2312 (STR ){
  VaR  Strout  =     ''  ;
  For  (  VaR  I  =  0  ; I  < Str. length; I  ++  ){
  VaR  C  =  Str. charat (I );
  //  + Is a space.  
    If  (C  =     '  +  ' ){
Strout  + =     '     '  ;
}
  //  A, B, C, 1, 2, etc., starting with not %, directly return itself  
    Else     If  (C  ! =    '  %  '  ){
Strout  + =  C;
}
  //  Starting with %  
    Else  {
I  ++  ;
  VaR  Nextc  = Str. charat (I );
  //  Number, not Chinese Characters  
    If  (  !  Isnan (parseint (nextc ))){
I  ++  ;
Strout  + =  Decodeuricomponent (C  +  Nextc  + Str. charat (I ));
}
  Else  {
  VaR  X  =     New  String ();
  Try  
{
  VaR  Code  =  Str. substr (I,  2  ) +  Str. substr (I  +  3  ,  2  );
I  =  I  +     4  ;

  VaR  Index  =     - 1  ;
  While  (Index  =  Z. indexof (Code, Index  +  1  ))  ! =     -  1  ){
  If  (Index  %  4    =     0  ){
Strout  + =  String. fromcharcode (Index  /  4 + 19968 );  
    Break  ;
}
}
}  Catch  (E ){}
}
}
}
 Return  Strout;
}
  VaR  Z  =  '  {0}  '  ; 

(Chinese Punctuation is not considered here. It is mainly because the Chinese Punctuation in Unicode is mixed with those in Japan and South Korea. If the punctuation is distributed in a few places, you will be too lazy to get it. You can send me a copy if someone else gets it. Thank you .)

Finally, use. Net to generate code at Z:

 

Code

  Stringbuilder sb  =    New  Stringbuilder ();
String strformat  =  @  "  ... Z ='  "  ;  //  Previous JS Code  
  Const  Int  Minhanzi  =    19968  ;
Const  Int  Maxhanzi  =     40869  ;
  For  (  Int  I  =  Minhanzi; I  <  Maxhanzi  +    1  ; I  ++  )
{
  Byte  [] Bytes  =  Encoding. getencoding (  "  Gb2312  "  ). Getbytes (((  Char  ) I). tostring ());
SB. appendformat (  "  {0} {1} "  , Convert. tostring (Bytes [  0  ],  16  ). Toupper (), convert. tostring (Bytes [  1  ],  16  ). Toupper ());
}
String Str  =  Strformat  +  SB. tostring (  0  , SB. Length -     1  )  +     "  ';  "  ;
System. Io. file. writealltext (@  "  F: \ encodegb2312.js  "  , STR, encoding. ASCII );
 

 

Final JS download: encodetogb2312.zip