功能丰富的wordpress点赞插件不少，但对于要在主题中集成简单文章点赞功能的需求，插件就显得不合适，于是乎非插件实现文章点赞功能的方法就诞生，实现思路是：可以通过ajax实时显示点赞数量，自定义字段保存赞数量，Cookies禁止重新点赞。
1、在当前主题functions.php文件中添加代码：

add_action('wp_ajax_nopriv_bigfa_like', 'bigfa_like');
add_action('wp_ajax_bigfa_like', 'bigfa_like');
function bigfa_like(){
    global $wpdb,$post;
    $id = $_POST["um_id"];
    $action = $_POST["um_action"];
    if ( $action == 'ding'){
        $bigfa_raters = get_post_meta($id,'bigfa_ding',true);
        $expire = time() + 99999999;
        $domain = ($_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false; // make cookies work with localhost
        setcookie('bigfa_ding_'.$id,$id,$expire,'/',$domain,false);
        if (!$bigfa_raters || !is_numeric($bigfa_raters)) {
            update_post_meta($id, 'bigfa_ding', 1);
        }else {
            update_post_meta($id, 'bigfa_ding', ($bigfa_raters + 1));
        }
        echo get_post_meta($id,'bigfa_ding',true);
    }
    die;
}

2、在主题的header.php文件的</head>前添加以下代码：

<script type="text/javascript">
$(document).ready(function() {
    $.fn.postLike = function() {
        if ($(this).hasClass('done')) {
            alert('您已赞过本博客');
            return false;
        } else {
            $(this).addClass('done');
            var id = $(this).data("id"),
            action = $(this).data('action'),
            rateHolder = $(this).children('.count');
            var ajax_data = {
                action: "bigfa_like",
                um_id: id,
                um_action: action
            };
            $.post("<?php bloginfo('url');?>/wp-admin/admin-ajax.php", ajax_data, function(data) {
                $(rateHolder).html(data);
            });
            return false;
        }
    };
    $(document).on("click", ".favorite", function() {
        $(this).postLike();
    });
});
</script>

3、在当前主题的single.php文件的<?php the_content();?>代码下面添加点赞按钮调用代码：

<div class="post-like">
    <a href="javascript:;" data-action="ding" data-id="<?php the_ID(); ?>" class="favorite<?php if(isset($_COOKIE['bigfa_ding_'.$post->ID])) echo ' done';?>">喜欢 <span class="count">
    <?php

        if( get_post_meta($post->ID,'bigfa_ding',true) ){

            echo get_post_meta($post->ID,'bigfa_ding',true);

        } else {

            echo '0';

        }

    ?></span>
    </a>
 </div>

4、在当前主题的style.css文件中添加点击按钮样式（仅供参考）：

.post-like{text-align:center;padding:10px}
.post-like a{ background-color:#21759B;border-radius: 3px;color: #FFFFFF;font-size: 12px;padding: 5px 10px;text-decoration: none;outline:none}
.post-like a.done, .post-like a:hover{background-color:#eee;color:#21759B;}
.post-like a.done{cursor:not-allowed}

来源：张力博客