问如何使用javascript按组排序数组？

EN

 var totalGroups = [];
        var actualGroup = [];

var contentarticles = articles.contentarticles,
                article,
                $out = $("#articlesOutput");


                for (var i = 0; i < contentarticles.length; i++) {
                    if (!article || article.title != contentarticles[i].title) {
                        article = contentarticles[i];

                        document.getElementById('articleForNaviTopTitle').innerHTML = article.title;
                        document.getElementById('articleForNaviTopID').innerHTML = article.id;

                        var articlesOutput = [
                            '<li><a href="./certifiedTraining/id=', article.id, '/step=', i + 1, '">',
                            article.title,
                            '</li>'
                        ].join("");
                        $out.append(articlesOutput);
                    }
                }
// till this point all works fine, and a code above gives results in the image below.

//**Im struggeling right there, how to sort this array by groups?????**

while (article.title(this) == article.title(next))
  {
  code block to be executed
  }