WordPress如何添加无刷新AJAX点赞功能

此段函数实现了无插件点赞功能，实现原理大体是通过自定义字段保存赞数量，通过 Cookie 记录并禁止重复赞。具体的代码如下：

1. //AJAX点赞

2. function dotGood()

3. {

4.  global $wpdb, $post;

5.  $id = $_POST["um_id"];

6.  if ($_POST["um_action"] == 'topTop') {

7.  $specs_raters = get_post_meta($id, 'dotGood', true);

8.  $expire = time() + 99999999;

9.  $domain = ($_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false; // make cookies work with localhost

10.  setcookie('dotGood_' . $id, $id, $expire, '/', $domain, false);

11.  if (!$specs_raters || !is_numeric($specs_raters)) update_post_meta($id, 'dotGood', 1);

12.  else update_post_meta($id, 'dotGood', ($specs_raters + 1));

13.  echo get_post_meta($id, 'dotGood', true);

14.  }

15.  die;

16. }

17. add_action('wp_ajax_nopriv_dotGood', 'dotGood');

18. add_action('wp_ajax_dotGood', 'dotGood');

    js 部分：

    1. //点赞

    2. $.fn.postLike = function () {

    3.  if ($(this).hasClass('done')) {

    4.         alert('点多了伤身体~');

    5.  return false;

    6.  } else {

    7.         $(this).addClass('done');

    8.  var id = $(this).data("id"),

    9.             action = $(this).data('action'),

    10.             rateHolder = $(this).children('.count');

    11.  var ajax_data = {

    12.             action: "dotGood",

    13.             um_id: id,

    14.             um_action: action

    15.  };

    16.         $.post("/wp-admin/admin-ajax.php", ajax_data,

    17.  function (data) {

    18.                 $(rateHolder).HTML(data);

    19.  });

    20.  return false;

    21.  }

    22. };

    23. $(".dotGood").click(function () {

    24.     $(this).postLike();

    25. });

    代码引用部分：

    1. <a href="javascript:;" data-action="topTop" data-id="<?php the_ID(); ?>"  class="dotGood <?php echo isset($_COOKIE['dotGood_' . $post->ID]) ? 'done' : ''; ?>">

    2.  <span class="count"><?php echo ($dot_good=get_post_meta($post->ID, 'dotGood', true)) ? $dot_good : '0'; ?></span>

    3. </a>

    对于代码引用部分，还可以加点 CSS：

    1. .post-like{margin:10% 0 0;position:relative;}

    2. .post-like a.dotGood{height:30px;line-height:30px;width:30px;font-size:24px;text-align:center;display:inline-block;cursor: pointer;position:relative;}

    3. .post-like a.dotGood.done{color: #e2264d;}

    4. .post-like a.dotGood span{position:absolute;display:inline-block;top:0;left:26px;width:auto;font-size:14px;}

    5. .post-like a.dotGood span:before{content:'+';}