实现原理
通过自定义字段保存赞数量，通过 cookies 来禁止重复赞。
然后需要添加些代码实现此功能，下面一一列出。
1、将下面代码添加进function.php
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、将以下代码扔进footer.php文件
<script type="text/javascript">
$.fn.postLike = function() {
if ($(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() {
$(this).postLike();
});
</script>3、修改single.php文件，在你想要添加的地方，加入下列代码：
<a href="javascript:;" data-action="ding" data-id="<?php the_ID(); ?>" class="favorite<?php if(isset($_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>
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