js 简单倒计时插件和使用方法

// 倒计时插件
(function (){
function countdown(config){
var startDate = config.start ? new Date(config.start) : new Date();
var endDate = new Date(config.end);
var id = config.id || 'countdown';

var time = (endDate - startDate)/1000;

if(time < 0){
if(config.callback){
config.callback();
}
return;
}

var day = parseInt(time/86400, 10);
var hour = parseInt(time%86400/60/60, 10);
var minute = parseInt(time%86400%3600/60, 10);
var second = parseInt(time%86400%3600%60, 10);
var mayday = day > 0?day+'天':'';
var mayhour = hour<10?'0'+hour:hour;
var mayminute = minute<10?'0'+minute : minute;
var maysecond = second<10?'0'+second : second;
setTimeout(function (){
document.getElementById(id).innerHTML = mayday+mayhour+':'+mayminute+':'+maysecond;
countdown(config);
}, 1000);
}

window.countdown = countdown;
})();
// 引用倒计时
countdown({
'end':'2016/6/6 19:19:00',
'callback':function () {
// document.getElementById('countdown').innerHTML = 'the end!';
$('.login_award_time').remove();
}
});