文字コードを変換する(SHIFT_JISやEUC-JPからUTF8へ)

$(function(){
/*
//encoding-japaneseはget後判定の役には立たなかった
//https://github.com/polygonplanet/encoding.js/blob/master/README_ja.md
//https://cdnjs.com/libraries/encoding-japanese
  $.get('sjis.txt', function(data){
    $p = $('<p>').text(data);
    $('#demo').append($p);
    const codes = new Uint8Array(data);
    const encoding = Encoding.detect(codes);
    var ary = Encoding.stringToCode(data);
    console.log(ary);
    var detectedEncoding = Encoding.detect(encoding);
    $p2 = $('<p>').text(detectedEncoding);
    $('#demo').append($p2);
  });
  $.get('eucjp.txt', function(data){
    $p = $('<p>').text(data);
    $('#demo').append($p);
    const codes = new Uint8Array(data);
    const encoding = Encoding.detect(codes);
    var ary = Encoding.stringToCode(data);
    console.log(ary);
    var detectedEncoding = Encoding.detect(encoding);
    $p2 = $('<p>').text(detectedEncoding);
    $('#demo').append($p2);
  });
*/


  var getText = function(fileName){
    var charset = 'utf-8';
    if(fileName.match(/sjis/)){charset = 'shift_jis';}
    if(fileName.match(/euc/)){charset = 'euc-jp';}
    $.ajax({
        beforeSend : function(xhr) {
            xhr.overrideMimeType('text/plain; charset=' + charset);
        },
        url : fileName,
        dataType : 'text'
    }).done(function(data) {
      $a = $('<a>').text(fileName).attr({href:fileName});
      $p = $('<p>').text(data);
      $('#demo').append($p).append($a);
    });
  }

  getText('sjis.txt');
  getText('eucjp.txt');

});

ページのソースを表示 : Ctrl+U , DevTools : F12

view-source:https://hi0a.com/demo/-js/js-encoding-japanese/