倒计时

var left_1 = '260'; // 剩余时间，秒为单位
					
setTime_1();					
function setTime_1() {

if (left_1) {
left_1 --;
if(left_1 > 0) {
var hour = Math.floorleft_1 / 3600);
hour = (hour < 10) ? ('0' + hour) : hour;
var minute = Math.floor((left_1 % 3600) / 60);
minute = (minute < 10) ? ('0' + minute) : minute;
var second = (left_1 % 3600) % 60;
second = (second < 10) ? ('0' + second) : second;

var time = document.getElementById('divTime'); //divTime 是要将内容显示出来的一个DIV
time.innerHTML = '还u21097 <span>' + hour + '</span>小u26102 <span>' + minute + '</span>分span >' + second + '</span>秒;
} else {
var time = document.getElementById('divTime');
time.innerHTML = '超出购买时间';
}

} else {
var time = document.getElementById('divTime');
time.innerHTML = '超出购买时间';
}
}
window.setInterval(setTime_1, 1000);