javascript - Jscript 在开发和测试机器上返回不同的(计算的)结果 - 使用相同的代码

Question

好的，在我的开发机器上，我有以下代码:

JScript

setInterval(function () { myTimer(); }, 1000);

function myTimer() {
    var d = new Date();
    var hrs = d.getHours();
    var min = d.getMinutes();
    var sec = d.getSeconds();
    var dayOfWeek = d.getDay();

    // Let's do this logically.
    // To get the number of victims so far today we need to know how many seconds have passed so far today.
    var totalSeconds = sec + (min * 60) + (hrs * 3600); // Number of Seconds passed so far today.
    // Now multiply that by 14 in accordance with Symantec's research.
    var VictimsToday = totalSeconds * 14;

    // To get the number of victims this week we need to multiply
    // The number of seconds in a day by the number of full days and add the number of seconds of this partial day.
    var TotalSecondsInADay = 86400; // According to Google.
    var DaysSoFarThisWeek = dayOfWeek + 1; // Removes today as a partial day.
    // We already know how many seconds are in this partial day = totalSeconds
    // So our calculation is
    var tsD = TotalSecondsInADay * DaysSoFarThisWeek;
    var VictimsThisWeek = (totalSeconds + tsD) * 14;

    // Now we get the Day of the Year remove today as a partial day and calculate
    // Number of seconds a day by the number of complete days so far + todays partial day
    var DOY = DayOfYear();
    var tsY = DOY * totalSeconds;
    var VictimsThisYear = (totalSeconds + tsY) * 14;

    document.getElementById("FooterStatistics").innerHTML = Intl.NumberFormat().format(VictimsToday);
    document.getElementById("FooterStatistics2").innerHTML = Intl.NumberFormat().format(VictimsThisWeek);
    document.getElementById("FooterStatistics4").innerHTML = Intl.NumberFormat().format(VictimsThisYear);
}

function DayOfYear() {
    var today = new Date();
    var first = new Date(today.getFullYear(), 0, 1);
    var theDay = Math.round(((today - first) / 1000 / 60 / 60 / 24) + 0.5, 0);
    return theDay;
}

HTML 为:

body

<div id="FooterStatistics"></div>
<div id="FooterStatistics2"></div>
<div id="FooterStatistics4"></div>

现在在开发机器上，DIV 中返回的计算结果是:

但是，当我在 W3Schools Tryit 编辑器上运行此命令时:http://www.w3schools.com/js/tryit.asp?filename=tryjs_date_getday

我得到了完全不同的计算结果:

现在我知道由于时区差异，数字会有所不同 - 实际计算不应有所不同。 Dev 机器的第二个结果比第一个结果小，这是不应该的，而第三个结果显然甚至不是一个数字 - TryIt 编辑器中的结果提供了更合理的答案。

怎么会这样？

Answer 1

创建应用程序时，继续使用 console.log() 检查值。这确实有助于了解 future 正在发生的事情。虽然这不能替代调试，但它会有所帮助。只有当您的代码即将上线，或者您确定它可以工作并且抽象得很好时，您才能删除它们。

PS:避免使用 w3schools.com。使用MDN 。好多了。