WordPress增加点赞功能

1、functions：

[pre]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;
}[/pre]

2、JS

[pre]$(document).ready(function() {
$.fn.postLike = function() {
if ($(this).hasClass('done')) {
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("./wp-admin/admin-ajax.php", ajax_data,
function(data) {
$(rateHolder).html(data);
});
return false;
}
};
$(document).on("click", ".favorite",
function() {
$(this).postLike();
});
}); [/pre]

3、single

[pre]<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';?>">大挖好帅 <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>[/pre]

4、CSS

[pre]
.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}[/pre]