JSOM: Using "KeywordQuery" class

function search()
{

    try
    {
        SP.SOD.registerSod('sp.search.js', "/_layouts/15/sp.search.js");

        SP.SOD.executeFunc('sp.search.js', 'Microsoft.SharePoint.Client.Search.Query.KeywordQuery', function() {
            var context = SP.ClientContext.get_current();
            var keywordQuery = new Microsoft.SharePoint.Client.Search.Query.KeywordQuery(context);
            keywordQuery.set_queryText("ContentTypeId:0x0101*")
            keywordQuery.RowLimit = 5;
            keywordQuery.EnableSorting = true;
            keywordQuery.SortList = "Title";
            keywordQuery.TrimDuplicates = false;

            var searchExecutor = new Microsoft.SharePoint.Client.Search.Query.SearchExecutor(context);

            results = searchExecutor.executeQuery(keywordQuery);

            context.executeQueryAsync(onQuerySuccess, onFailed);
        });
    }
    catch (err)
    {
        //log error
    }
}