change the link color if a post has been read wordpress

/* set according to site domain */
var siteHost = "myurl.com";

var linkClasses = {
    /* adjust string values as classes to suit css rules, keys match term to look for in url */
    post: 'post',
    forum: 'forum',
    project: 'project'
}

$('a').each(function () {

    var host = this.hostname; /* returns domain.com */
    if (host !== siteHost) {
        return; /* not a local link, quit here */
    }
    var newClass = '';
    var path = this.pathname; /* returns eveything after http://myurl.com  */

    if (path && path !== '/') {
        /* we only want to look at first part of path*/
        var mainPath = path.split('/')[1];
        /* now check all the various terms in linkClasses object */ 
        $.each(linkClasses, function (key, value) {
            if (mainPath.indexOf(key) > -1) {
                newClass = linkClasses[key];
            }
        });

        $(this).addClass(newClass);
    } else {
        /* is home page link */
        $(this).addClass('home'); /* to test home page link finding ability */
    }
});