相信很多站长想要实现倒计时功能，特别针对企业性质站点，当推出促销活动，有倒计时功能更能促进客户快速转化，所以把倒计时功能开发出来就变得尤其重要了！
1、把下面的代码保存为 countdownjs.js，保存在当前所使用主题的 js/目录里：
function getAdd(time){
if(time<10){
return "0"+time;
}else{
return time;
}
}
var interval = 1000;
function ShowCountDown(year,month,day,hourd,minuted){
var now = new Date();
var endDate = new Date(year, month-1, day, hourd, minuted);
var leftTime = endDate.getTime() - now.getTime();
var leftsecond = parseInt(leftTime/1000);
var day = Math.floor(leftsecond/(606024));
day = day < 0 ? 0 : day;
var hour = Math.floor((leftsecond-day2460*60)/3600);
hour = hour < 0 ? 0 : hour;
var minute = Math.floor((leftsecond-day246060-hour3600)/60);
minute = minute < 0 ? 0 : minute;
var second = Math.floor(leftsecond-day246060-hour3600-minute*60);
second = second < 0 ? 0 : second;
var getDay = getAdd(day);
var getHour = getAdd(hour);
var getMinute = getAdd(minute);
var getSecond = getAdd(second);
if(endDate > now){
document.getElementById('time').innerHTML = '活动倒计时：';
document.getElementById('day').innerHTML = getDay +'天';
document.getElementById('hour').innerHTML = getHour +'时';
document.getElementById('min').innerHTML = getMinute +'分';
document.getElementById('sec').innerHTML = getSecond +'秒';
}else{
document.getElementById('countdown').innerHTML= '本次活动已经结束'
}
}2、把下面的代码添加到当前主题的 functions.php 文件最后一个 ?> 的前面：
function countdown($atts, $content=null) {
extract(shortcode_atts(array("time" => ''), $atts));
date_default_timezone_set('PRC');
$endtime=strtotime($time);
$nowtime=time();
global $endtimes;
$endtimes = str_replace(array("-"," ",":"),",",$time);
if($endtime>$nowtime){
return '
<div id="countdown">
<span id="time"></span>
<span id="day"></span>
<span id="hour"></span>
<span id="min"></span>
<span id="sec"></span>
</div>
';
}else{
return '本次活动已经结束';
}
}
function countdown_js() {
global $endtimes;
echo '<script>window.setInterval(function(){ShowCountDown('.$endtimes.');}, interval);</script>'."n";
}
add_shortcode('countdown', 'countdown');
add_action('wp_footer', 'countdown_js');
wp_register_script( 'countdown_js', get_template_directory_uri() . '/js/countdownjs.js', array(), '1.0', false );
wp_enqueue_script( 'countdown_js' );3、在发布/更新文章的时候，切换到文末模式，然后在想要插入倒计时的位置添加以下短代码：
[countdown time="2019-01-15 18:41:57"]其中 time="2019-01-15 18:41:57"引号中的时间就是活动结束时间，修改为其他日期时间时请保持格式一致即可。