在Mustache示例中有特殊处理，因为它需要处理2个字符的分隔符（例如，在'{{'和'}}'中有两个字符。我以前从未使用过CodeMirror，所以这只是一个猜测，不过请尝试这样的事情：

There is special handling in the Mustache example because it needs to handle 2-character delimiters (e.g. there are two characters in '{{' and '}}'). I've never used CodeMirror before, so this is just a guess, but try something like this:

CodeMirror.defineMode("mymode", function(config, parserConfig) {
  var mymodeOverlay = {
    token: function(stream, state) {
      if (stream.match("{")) {
        while ((ch = stream.next()) != null)
          if (ch == "}") break;
        return "mymode";
      }
      while (stream.next() != null && !stream.match("{", false)) {}
      return null;
    }
  };
  return CodeMirror.overlayParser(CodeMirror.getMode(config, parserConfig.backdrop || "text/html"), mymodeOverlay);
});

编辑

有效（尽管它也突出显示小写字母的单词）

it works (though it highlights words with lowercase letters too)

此应该有效：

token: function(stream, state) {
  if (stream.match("{")) {
    while ((ch = stream.next()) != null && ch === ch.toUpperCase())
      if (ch == "}") break;
    return "mymode";
  }
  while (stream.next() != null && !stream.match("{", false)) {}
  return null;
}