我的看法是，去掉所有口音和特殊字符。我混合了Lewis Diamond优雅的重音删除方法和社区wiki的快速字符替换余下的字符。结果是一个Ascii字符串。

function convertToAscii(string) {
    const unicodeToAsciiMap = {'Ⱥ':'A','Æ':'AE','Ꜻ':'AV','Ɓ':'B','Ƀ':'B','Ƃ':'B','Ƈ':'C','Ȼ':'C','Ɗ':'D','Dz':'D','Dž':'D','Đ':'D','Ƌ':'D','DŽ':'DZ','Ɇ':'E','Ꝫ':'ET','Ƒ':'F','Ɠ':'G','Ǥ':'G','Ⱨ':'H','Ħ':'H','Ɨ':'I','Ꝺ':'D','Ꝼ':'F','Ᵹ':'G','Ꞃ':'R','Ꞅ':'S','Ꞇ':'T','Ꝭ':'IS','Ɉ':'J','Ⱪ':'K','Ꝃ':'K','Ƙ':'K','Ꝁ':'K','Ꝅ':'K','Ƚ':'L','Ⱡ':'L','Ꝉ':'L','Ŀ':'L','Ɫ':'L','Lj':'L','Ł':'L','Ɱ':'M','Ɲ':'N','Ƞ':'N','Nj':'N','Ꝋ':'O','Ꝍ':'O','Ɵ':'O','Ø':'O','Ƣ':'OI','Ɛ':'E','Ɔ':'O','Ȣ':'OU','Ꝓ':'P','Ƥ':'P','Ꝕ':'P','Ᵽ':'P','Ꝑ':'P','Ꝙ':'Q','Ꝗ':'Q','Ɍ':'R','Ɽ':'R','Ꜿ':'C','Ǝ':'E','Ⱦ':'T','Ƭ':'T','Ʈ':'T','Ŧ':'T','Ɐ':'A','Ꞁ':'L','Ɯ':'M','Ʌ':'V','Ꝟ':'V','Ʋ':'V','Ⱳ':'W','Ƴ':'Y','Ỿ':'Y','Ɏ':'Y','Ⱬ':'Z','Ȥ':'Z','Ƶ':'Z','Œ':'OE','ᴀ':'A','ᴁ':'AE','ʙ':'B','ᴃ':'B','ᴄ':'C','ᴅ':'D','ᴇ':'E','ꜰ':'F','ɢ':'G','ʛ':'G','ʜ':'H','ɪ':'I','ʁ':'R','ᴊ':'J','ᴋ':'K','ʟ':'L','ᴌ':'L','ᴍ':'M','ɴ':'N','ᴏ':'O','ɶ':'OE','ᴐ':'O','ᴕ':'OU','ᴘ':'P','ʀ':'R','ᴎ':'N','ᴙ':'R','ꜱ':'S','ᴛ':'T','ⱻ':'E','ᴚ':'R','ᴜ':'U','ᴠ':'V','ᴡ':'W','ʏ':'Y','ᴢ':'Z','ᶏ':'a','ẚ':'a','ⱥ':'a','æ':'ae','ꜻ':'av','ɓ':'b','ᵬ':'b','ᶀ':'b','ƀ':'b','ƃ':'b','ɵ':'o','ɕ':'c','ƈ':'c','ȼ':'c','ȡ':'d','ɗ':'d','ᶑ':'d','ᵭ':'d','ᶁ':'d','đ':'d','ɖ':'d','ƌ':'d','ı':'i','ȷ':'j','ɟ':'j','ʄ':'j','dž':'dz','ⱸ':'e','ᶒ':'e','ɇ':'e','ꝫ':'et','ƒ':'f','ᵮ':'f','ᶂ':'f','ɠ':'g','ᶃ':'g','ǥ':'g','ⱨ':'h','ɦ':'h','ħ':'h','ƕ':'hv','ᶖ':'i','ɨ':'i','ꝺ':'d','ꝼ':'f','ᵹ':'g','ꞃ':'r','ꞅ':'s','ꞇ':'t','ꝭ':'is','ʝ':'j','ɉ':'j','ⱪ':'k','ꝃ':'k','ƙ':'k','ᶄ':'k','ꝁ':'k','ꝅ':'k','ƚ':'l','ɬ':'l','ȴ':'l','ⱡ':'l','ꝉ':'l','ŀ':'l','ɫ':'l','ᶅ':'l','ɭ':'l','ł':'l','ſ':'s','ẜ':'s','ẝ':'s','ɱ':'m','ᵯ':'m','ᶆ':'m','ȵ':'n','ɲ':'n','ƞ':'n','ᵰ':'n','ᶇ':'n','ɳ':'n','ꝋ':'o','ꝍ':'o','ⱺ':'o','ø':'o','ƣ':'oi','ɛ':'e','ᶓ':'e','ɔ':'o','ᶗ':'o','ȣ':'ou','ꝓ':'p','ƥ':'p','ᵱ':'p','ᶈ':'p','ꝕ':'p','ᵽ':'p','ꝑ':'p','ꝙ':'q','ʠ':'q','ɋ':'q','ꝗ':'q','ɾ':'r','ᵳ':'r','ɼ':'r','ᵲ':'r','ᶉ':'r','ɍ':'r','ɽ':'r','ↄ':'c','ꜿ':'c','ɘ':'e','ɿ':'r','ʂ':'s','ᵴ':'s','ᶊ':'s','ȿ':'s','ɡ':'g','ᴑ':'o','ᴓ':'o','ᴝ':'u','ȶ':'t','ⱦ':'t','ƭ':'t','ᵵ':'t','ƫ':'t','ʈ':'t','ŧ':'t','ᵺ':'th','ɐ':'a','ᴂ':'ae','ǝ':'e','ᵷ':'g','ɥ':'h','ʮ':'h','ʯ':'h','ᴉ':'i','ʞ':'k','ꞁ':'l','ɯ':'m','ɰ':'m','ᴔ':'oe','ɹ':'r','ɻ':'r','ɺ':'r','ⱹ':'r','ʇ':'t','ʌ':'v','ʍ':'w','ʎ':'y','ᶙ':'u','ᵫ':'ue','ꝸ':'um','ⱴ':'v','ꝟ':'v','ʋ':'v','ᶌ':'v','ⱱ':'v','ⱳ':'w','ᶍ':'x','ƴ':'y','ỿ':'y','ɏ':'y','ʑ':'z','ⱬ':'z','ȥ':'z','ᵶ':'z','ᶎ':'z','ʐ':'z','ƶ':'z','ɀ':'z','œ':'oe','ₓ':'x'};
    const stringWithoutAccents = string.normalize("NFD").replace(/[\u0300-\u036f]/g, '');
    return stringWithoutAccents.replace(/[^\u0000-\u007E]/g, character => unicodeToAsciiMap[character] || '');
}

通过给定的测试，一个解决方案似乎要快得多:http://jsperf.com/diacritics/9

function removeDiacritics(str) {
   return str.replace(/[^A-Za-z0-9\s]+/g, function(a){
      return diacriticsMap[a] || a; 
   });
}
removeDiacritics(teste);

工作示例:http://jsbin.com/sovorute/1/edit

推理:这样做速度更快的一个原因是，我们只遍历由负正则表达式模式选择的特殊字符。最快的测试(不带in的字符串迭代)在给定文本上迭代1001，这意味着每个字符。这个函数只迭代了35次，输出了相同的结果。请记住，这将只替换地图中所指示的内容。

关于这个主题的经典文章:http://alistapart.com/article/accent-folding-for-auto-complete

来源:http://semplicewebsites.com/removing-accents-javascript，也提供了一个不错的人物地图。

我发现所有这些都有点笨拙，而且我不太擅长正则表达式，所以这里有一个更简单的版本。将它翻译成你最喜欢的服务器端语言是很容易的，假设字符串已经在Unicode中:

// String containing replacement characters for stripping accents 
var stripstring = 
    'AAAAAAACEEEEIIII'+
    'DNOOOOO.OUUUUY..'+
    'aaaaaaaceeeeiiii'+
    'dnooooo.ouuuuy.y'+
    'AaAaAaCcCcCcCcDd'+
    'DdEeEeEeEeEeGgGg'+
    'GgGgHhHhIiIiIiIi'+
    'IiIiJjKkkLlLlLlL'+
    'lJlNnNnNnnNnOoOo'+
    'OoOoRrRrRrSsSsSs'+
    'SsTtTtTtUuUuUuUu'+
    'UuUuWwYyYZzZzZz.';

function stripaccents(str){
    var answer='';
    for(var i=0;i<str.length;i++){
        var ch=str[i];
        var chindex=ch.charCodeAt(0)-192;   // Index of character code in the strip string
        if(chindex>=0 && chindex<stripstring.length){
            // Character is within our table, so we can strip the accent...
            var outch=stripstring.charAt(chindex);
            // ...unless it was shown as a '.'
            if(outch!='.')ch=outch;
        }
        answer+=ch;
    }
    return answer;
}

我的看法是，去掉所有口音和特殊字符。我混合了Lewis Diamond优雅的重音删除方法和社区wiki的快速字符替换余下的字符。结果是一个Ascii字符串。

function convertToAscii(string) {
    const unicodeToAsciiMap = {'Ⱥ':'A','Æ':'AE','Ꜻ':'AV','Ɓ':'B','Ƀ':'B','Ƃ':'B','Ƈ':'C','Ȼ':'C','Ɗ':'D','Dz':'D','Dž':'D','Đ':'D','Ƌ':'D','DŽ':'DZ','Ɇ':'E','Ꝫ':'ET','Ƒ':'F','Ɠ':'G','Ǥ':'G','Ⱨ':'H','Ħ':'H','Ɨ':'I','Ꝺ':'D','Ꝼ':'F','Ᵹ':'G','Ꞃ':'R','Ꞅ':'S','Ꞇ':'T','Ꝭ':'IS','Ɉ':'J','Ⱪ':'K','Ꝃ':'K','Ƙ':'K','Ꝁ':'K','Ꝅ':'K','Ƚ':'L','Ⱡ':'L','Ꝉ':'L','Ŀ':'L','Ɫ':'L','Lj':'L','Ł':'L','Ɱ':'M','Ɲ':'N','Ƞ':'N','Nj':'N','Ꝋ':'O','Ꝍ':'O','Ɵ':'O','Ø':'O','Ƣ':'OI','Ɛ':'E','Ɔ':'O','Ȣ':'OU','Ꝓ':'P','Ƥ':'P','Ꝕ':'P','Ᵽ':'P','Ꝑ':'P','Ꝙ':'Q','Ꝗ':'Q','Ɍ':'R','Ɽ':'R','Ꜿ':'C','Ǝ':'E','Ⱦ':'T','Ƭ':'T','Ʈ':'T','Ŧ':'T','Ɐ':'A','Ꞁ':'L','Ɯ':'M','Ʌ':'V','Ꝟ':'V','Ʋ':'V','Ⱳ':'W','Ƴ':'Y','Ỿ':'Y','Ɏ':'Y','Ⱬ':'Z','Ȥ':'Z','Ƶ':'Z','Œ':'OE','ᴀ':'A','ᴁ':'AE','ʙ':'B','ᴃ':'B','ᴄ':'C','ᴅ':'D','ᴇ':'E','ꜰ':'F','ɢ':'G','ʛ':'G','ʜ':'H','ɪ':'I','ʁ':'R','ᴊ':'J','ᴋ':'K','ʟ':'L','ᴌ':'L','ᴍ':'M','ɴ':'N','ᴏ':'O','ɶ':'OE','ᴐ':'O','ᴕ':'OU','ᴘ':'P','ʀ':'R','ᴎ':'N','ᴙ':'R','ꜱ':'S','ᴛ':'T','ⱻ':'E','ᴚ':'R','ᴜ':'U','ᴠ':'V','ᴡ':'W','ʏ':'Y','ᴢ':'Z','ᶏ':'a','ẚ':'a','ⱥ':'a','æ':'ae','ꜻ':'av','ɓ':'b','ᵬ':'b','ᶀ':'b','ƀ':'b','ƃ':'b','ɵ':'o','ɕ':'c','ƈ':'c','ȼ':'c','ȡ':'d','ɗ':'d','ᶑ':'d','ᵭ':'d','ᶁ':'d','đ':'d','ɖ':'d','ƌ':'d','ı':'i','ȷ':'j','ɟ':'j','ʄ':'j','dž':'dz','ⱸ':'e','ᶒ':'e','ɇ':'e','ꝫ':'et','ƒ':'f','ᵮ':'f','ᶂ':'f','ɠ':'g','ᶃ':'g','ǥ':'g','ⱨ':'h','ɦ':'h','ħ':'h','ƕ':'hv','ᶖ':'i','ɨ':'i','ꝺ':'d','ꝼ':'f','ᵹ':'g','ꞃ':'r','ꞅ':'s','ꞇ':'t','ꝭ':'is','ʝ':'j','ɉ':'j','ⱪ':'k','ꝃ':'k','ƙ':'k','ᶄ':'k','ꝁ':'k','ꝅ':'k','ƚ':'l','ɬ':'l','ȴ':'l','ⱡ':'l','ꝉ':'l','ŀ':'l','ɫ':'l','ᶅ':'l','ɭ':'l','ł':'l','ſ':'s','ẜ':'s','ẝ':'s','ɱ':'m','ᵯ':'m','ᶆ':'m','ȵ':'n','ɲ':'n','ƞ':'n','ᵰ':'n','ᶇ':'n','ɳ':'n','ꝋ':'o','ꝍ':'o','ⱺ':'o','ø':'o','ƣ':'oi','ɛ':'e','ᶓ':'e','ɔ':'o','ᶗ':'o','ȣ':'ou','ꝓ':'p','ƥ':'p','ᵱ':'p','ᶈ':'p','ꝕ':'p','ᵽ':'p','ꝑ':'p','ꝙ':'q','ʠ':'q','ɋ':'q','ꝗ':'q','ɾ':'r','ᵳ':'r','ɼ':'r','ᵲ':'r','ᶉ':'r','ɍ':'r','ɽ':'r','ↄ':'c','ꜿ':'c','ɘ':'e','ɿ':'r','ʂ':'s','ᵴ':'s','ᶊ':'s','ȿ':'s','ɡ':'g','ᴑ':'o','ᴓ':'o','ᴝ':'u','ȶ':'t','ⱦ':'t','ƭ':'t','ᵵ':'t','ƫ':'t','ʈ':'t','ŧ':'t','ᵺ':'th','ɐ':'a','ᴂ':'ae','ǝ':'e','ᵷ':'g','ɥ':'h','ʮ':'h','ʯ':'h','ᴉ':'i','ʞ':'k','ꞁ':'l','ɯ':'m','ɰ':'m','ᴔ':'oe','ɹ':'r','ɻ':'r','ɺ':'r','ⱹ':'r','ʇ':'t','ʌ':'v','ʍ':'w','ʎ':'y','ᶙ':'u','ᵫ':'ue','ꝸ':'um','ⱴ':'v','ꝟ':'v','ʋ':'v','ᶌ':'v','ⱱ':'v','ⱳ':'w','ᶍ':'x','ƴ':'y','ỿ':'y','ɏ':'y','ʑ':'z','ⱬ':'z','ȥ':'z','ᵶ':'z','ᶎ':'z','ʐ':'z','ƶ':'z','ɀ':'z','œ':'oe','ₓ':'x'};
    const stringWithoutAccents = string.normalize("NFD").replace(/[\u0300-\u036f]/g, '');
    return stringWithoutAccents.replace(/[^\u0000-\u007E]/g, character => unicodeToAsciiMap[character] || '');
}

假设你知道你在做什么，我怀疑IE6没有正确地解释文件的编码，因此不能识别文件中的非ascii字符:

确保文件保存为UTF-8格式(例如) 使用Fiddler或其他工具检查web服务器是否发送正确的内容编码HTTP报头。

(虽然它“闻起来”不对，但我会考虑做排序，比如在服务器上使用一些locale感知的东西……但无论如何…)

这里有一个非常简单的解决方案，没有太多的代码，使用一个非常简单的变音符的映射，其中包括一些或全部映射到包含多个字符的ascii等价物，即Æ => AE, ffi => ffi，等等…还包括一些非常基本的功能测试

var diacriticsMap = {
  '\u00C0': 'A',  // À => A
  '\u00C1': 'A',   // Á => A
  '\u00C2': 'A',   // Â => A
  '\u00C3': 'A',   // Ã => A
  '\u00C4': 'A',   // Ä => A
  '\u00C5': 'A',   // Å => A
  '\u00C6': 'AE', // Æ => AE
  '\u00C7': 'C',   // Ç => C
  '\u00C8': 'E',   // È => E
  '\u00C9': 'E',   // É => E
  '\u00CA': 'E',   // Ê => E
  '\u00CB': 'E',   // Ë => E
  '\u00CC': 'I',   // Ì => I
  '\u00CD': 'I',   // Í => I
  '\u00CE': 'I',   // Î => I
  '\u00CF': 'I',   // Ï => I
  '\u0132': 'IJ', // IJ => IJ
  '\u00D0': 'D',   // Ð => D
  '\u00D1': 'N',   // Ñ => N
  '\u00D2': 'O',   // Ò => O
  '\u00D3': 'O',   // Ó => O
  '\u00D4': 'O',   // Ô => O
  '\u00D5': 'O',   // Õ => O
  '\u00D6': 'O',   // Ö => O
  '\u00D8': 'O',   // Ø => O
  '\u0152': 'OE', // Π=> OE
  '\u00DE': 'TH', // Þ => TH
  '\u00D9': 'U',   // Ù => U
  '\u00DA': 'U',   // Ú => U
  '\u00DB': 'U',   // Û => U
  '\u00DC': 'U',   // Ü => U
  '\u00DD': 'Y',   // Ý => Y
  '\u0178': 'Y',   // Ÿ => Y
  '\u00E0': 'a',   // à => a
  '\u00E1': 'a',   // á => a
  '\u00E2': 'a',   // â => a
  '\u00E3': 'a',   // ã => a
  '\u00E4': 'a',   // ä => a
  '\u00E5': 'a',   // å => a
  '\u00E6': 'ae', // æ => ae
  '\u00E7': 'c',   // ç => c
  '\u00E8': 'e',   // è => e
  '\u00E9': 'e',   // é => e
  '\u00EA': 'e',   // ê => e
  '\u00EB': 'e',   // ë => e
  '\u00EC': 'i',   // ì => i
  '\u00ED': 'i',   // í => i
  '\u00EE': 'i',   // î => i
  '\u00EF': 'i',   // ï => i
  '\u0133': 'ij', // ij => ij
  '\u00F0': 'd',   // ð => d
  '\u00F1': 'n',   // ñ => n
  '\u00F2': 'o',   // ò => o
  '\u00F3': 'o',   // ó => o
  '\u00F4': 'o',   // ô => o
  '\u00F5': 'o',   // õ => o
  '\u00F6': 'o',   // ö => o
  '\u00F8': 'o',   // ø => o
  '\u0153': 'oe', // œ => oe
  '\u00DF': 'ss', // ß => ss
  '\u00FE': 'th', // þ => th
  '\u00F9': 'u',   // ù => u
  '\u00FA': 'u',   // ú => u
  '\u00FB': 'u',   // û => u
  '\u00FC': 'u',   // ü => u
  '\u00FD': 'y',   // ý => y
  '\u00FF': 'y',   // ÿ => y
  '\uFB00': 'ff', // ff => ff
  '\uFB01': 'fi',   // fi => fi
  '\uFB02': 'fl', // fl => fl
  '\uFB03': 'ffi',  // ffi => ffi
  '\uFB04': 'ffl',  // ffl => ffl
  '\uFB05': 'ft', // ſt => ft
  '\uFB06': 'st'  // st => st
};

function replaceDiacritics(str) {
  var returnStr = '';
  if(str) {
    for (var i = 0; i < str.length; i++) {
      if (diacriticsMap[str[i]]) {
        returnStr += diacriticsMap[str[i]];
      } else {
        returnStr += str[i];
      }
    }
  }
  return returnStr;
}

function testStripDiacritics(input, expected) {
  var coChar = replaceDiacritics(input);
  console.log('The character passed in was ' + input);
  console.log('The character that came out was ' + coChar);
  console.log('The character expected was' + expected);
}

testStripDiacritics('À','A');
testStripDiacritics('A','A');
testStripDiacritics('Æ','AE');
testStripDiacritics('AE','AE');
testStripDiacritics('ÇhÀrlËšYŸZŽ','ChArlEsYYZZ');