文章点赞（顶一个）功能的实现，三步走：

在functions.php内自定义点赞功能，代码如下：

//点赞功能
add_action('wp_ajax_nopriv_inlo_like', 'inlo_like');
add_action('wp_ajax_inlo_like', 'inlo_like');
function inlo_like(){
    global $wpdb,$post;
    $id = $_POST["um_id"];
    $action = $_POST["um_action"];
    if ( $action == 'ding'){
    $inlo_raters = get_post_meta($id,'inlo_ding',true);
    $expire = time() + 99999999;
    $domain = ($_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false; // make cookies work with localhost
    setcookie('inlo_ding_'.$id,$id,$expire,'/',$domain,false);
    if (!$inlo_raters || !is_numeric($inlo_raters)) {
        update_post_meta($id, 'inlo_ding', 1);
    } 
    else {
            update_post_meta($id, 'inlo_ding', ($inlo_raters + 1));
        }   
    echo get_post_meta($id,'inlo_ding',true);    
    }     
    die;
}

html代码，将下面的div添加到需要点赞的位置：

<span class="zan"><a href="javascript:;" data-action="ding" data-id="<?php the_ID(); ?>" id="Addlike" class="action<?php if(isset($_COOKIE['inlo_ding_'.$post->ID])) echo ' actived';?> <?php $category = get_the_category();  echo $category[0]->category_nicename;?>"><i class="fa fa-thumbs-o-up"></i><span class="count"><?php if( get_post_meta($post->ID,'inlo_ding',true) ){ echo get_post_meta($post->ID,'inlo_ding',true); } else {echo '0';}?></span></a></span>

点赞数值增加以及点赞后的提示，用js实现：

//点赞功能
$(document).on("click", "#Addlike", function() {
    if ($(this).hasClass("actived")) {
        return alert("您已经赞过啦！");
    } else {
        $(this).addClass("actived");
        var z = $(this).data("id"), y = $(this).data("action"), x = $(this).children(".count");
        var w = {
            action: "inlo_like",
            um_id: z,
            um_action: y
        };
        $.post("/wp-admin/admin-ajax.php", w, function(A) {
            $(x).html(A);
        });
        $.tipsBox({
            obj: $(this),
            str: "+1",
            callback: function() {}
        });
        return false;
    }
});

最后是css，看着办吧，以上。