js实现倒计时

Posted 2020-10-29 魏耀峰

　　

　　

   //倒计时8分钟
    var getTime=sessionStorage.getItem("zicetime");
    var intDiff = parseInt(getTime * 60);//倒计时总秒数量
    function timer(intDiff){
        window.setInterval(function(){
        var day=0,
            hour=0,
            minute=0,
            second=0;//时间默认值        
        if(intDiff > 0){
            day = Math.floor(intDiff / (60 * 60 * 24));
            hour = Math.floor(intDiff / (60 * 60)) - (day * 24);
            minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);
            second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);
        }
        if (minute <= 9) minute = \'0\' + minute;
        if (second <= 9) second = \'0\' + second;
       // $(\'#day_show\').html(day+"天");
        $(\'#hour_show\').html(\'<s id="h"></s>\'+hour+\'时\');
        $(\'#minute_show\').html(\'<s></s>\'+minute+\'分\');
        $(\'#second_show\').html(\'<s></s>\'+second+\'秒\');
        intDiff--;

        // if(intDiff==50){
        //   alert(123)
        // }
        }, 1000);
    } 
    $(function(){
        timer(intDiff);
    });