javascript - setInterval性能

Question

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Javascript: setInterval() behaviour with 0 milliseconds

我只是想听听，将时间设置为 0 毫秒的 setInterval 是否存在问题？会不会有性能问题？拥有例如会更好吗？ 1000 毫秒？

我有这个脚本:

var countdown_id = setInterval(function() {
    var now = (new Date()).getTime()-(2*60*60*1000);
    ;
    $('.product').each(function() {
        var elm = $(this).attr('id');
        var prod_id = $("#"+elm+" #hidden-"+elm).val();


        var expires = $('#date-end-' + prod_id).val()*1000;

        var seconds_remaining = Math.round((expires - now)/1000);

        var hours = FormatNumberLength(Math.floor(seconds_remaining/(60*60)), 2);
        var sec_remaining = seconds_remaining-(hours*60*60);
        var minutes = FormatNumberLength(Math.floor(sec_remaining/60), 2);
        var sec_remaining2 = sec_remaining-(minutes*60);
        var seconds = FormatNumberLength(sec_remaining2, 2);

        var timestr = hours + ":" + minutes + ":"+seconds;

        if (expires) {
            if (seconds_remaining > 0) {
                $('#'+elm+' .time_left div').text(timestr);
            }
            else {
                $(this).hide();
            }
        }
        $('#'+elm+' .time_left div').text(timestr);
    });
}, 0);

提前致谢!

Answer 1

if it is a problem having a setInterval with time set to 0 milliseconds?

您不能将0设置为间隔，因为浏览器会忽略它。

Will there be any performance issues? And will it be better to have e.g. 1000 milliseconds?

当然，如果可能的话，1000 毫秒比 10 毫秒(不是零)要好。
每 10 毫秒做一件事比每 1000 毫秒做一次同样的事情花费更多。