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  <li><a href="../index.html">Language modes</a>
  <li><a class=active href="#">JavaScript</a>
</ul>

</div>

<article> <h2>JavaScript mode</h2>

<div><textarea id=“code” name=“code”> // Demo code (the actual new parser character stream implementation)

function StringStream(string) {

this.pos = 0;
this.string = string;

}

StringStream.prototype = {

done: function() {return this.pos >= this.string.length;},
peek: function() {return this.string.charAt(this.pos);},
next: function() {
  if (this.pos &lt; this.string.length)
    return this.string.charAt(this.pos++);
},
eat: function(match) {
  var ch = this.string.charAt(this.pos);
  if (typeof match == "string") var ok = ch == match;
  else var ok = ch &amp;&amp; match.test ? match.test(ch) : match(ch);
  if (ok) {this.pos++; return ch;}
},
eatWhile: function(match) {
  var start = this.pos;
  while (this.eat(match));
  if (this.pos > start) return this.string.slice(start, this.pos);
},
backUp: function(n) {this.pos -= n;},
column: function() {return this.pos;},
eatSpace: function() {
  var start = this.pos;
  while (/\s/.test(this.string.charAt(this.pos))) this.pos++;
  return this.pos - start;
},
match: function(pattern, consume, caseInsensitive) {
  if (typeof pattern == "string") {
    function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
    if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
      if (consume !== false) this.pos += str.length;
      return true;
    }
  }
  else {
    var match = this.string.slice(this.pos).match(pattern);
    if (match &amp;&amp; consume !== false) this.pos += match[0].length;
    return match;
  }
}

}; </textarea></div>

  <script>
    var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
      lineNumbers: true,
      matchBrackets: true,
      continueComments: "Enter",
      extraKeys: {"Ctrl-Q": "toggleComment"}
    });
  </script>

  <p>
    JavaScript mode supports several configuration options:
    <ul>
      <li><code>json</code> which will set the mode to expect JSON
      data rather than a JavaScript program.</li>
      <li><code>jsonld</code> which will set the mode to expect
      <a href="http://json-ld.org">JSON-LD</a> linked data rather
      than a JavaScript program (<a href="json-ld.html">demo</a>).</li>
      <li><code>typescript</code> which will activate additional
      syntax highlighting and some other things for TypeScript code
      (<a href="typescript.html">demo</a>).</li>
      <li><code>statementIndent</code> which (given a number) will
      determine the amount of indentation to use for statements
      continued on a new line.</li>
      <li><code>wordCharacters</code>, a regexp that indicates which
      characters should be considered part of an identifier.
      Defaults to <code>/[\w$]/</code>, which does not handle
      non-ASCII identifiers. Can be set to something more elaborate
      to improve Unicode support.</li>
    </ul>
  </p>

  <p><strong>MIME types defined:</strong> <code>text/javascript</code>, <code>application/json</code>, <code>application/ld+json</code>, <code>text/typescript</code>, <code>application/typescript</code>.</p>
</article>