js倒计时功能

function countDown(count) {
    document.getElementById('showtimes').innerHTML = count;

    if (count == 0) {
        // do job
    } else {
        count -= 1;
        setTimeout(function () {
            countDown(count);
        }, 1000);
    }

}

function countDown() {
    var count=$("#hideInput").val();

    if (count == 0) {
        // do job
    } else {
        count -= 1;
　　　　$("#hideInput").val(count);
        setTimeout(function () {
            countDown(count);
        }, 1000);
    }

}