javascript - 为什么减去日期对象不起作用

Question

我有这个功能:

function CompareDate() {
    var timeNow = '03.04.2019';
    var timeNowSplit = timeNow.split('.');
    var timeTarget = '04.04.2019';
    var timeTargetSplit = timeTarget.split('.');

    var timeNowObj = new Date(timeNowSplit[2], timeNowSplit[1], timeNowSplit[0]).toUTCString();
    var timeTargetObj = new Date(timeTargetSplit[2], timeTargetSplit[1], timeTargetSplit[0]).toUTCString();

    difference = timeTargetObj - timeNowObj;
    console.log(difference)
}

如果我在 Node.js 控制台中启动它，我会得到:

"C:\Program Files\nodejs\node.exe" C:\Users\s.manns.WebStorm2018.3\config\scratches\scratch.js NaN

我在 How to calculate date difference in javascript 上找到的解决方案

但是为什么这段代码只返回“NaN”？

Answer 1

原因是因为您正在尝试计算两个字符串的差异。从两者中删除 toUTCString() ，它将产生有效的响应。为了完整起见，请注意您收到的响应将以毫秒为单位!

var timeNow = '03.04.2019';
    var timeNowSplit = timeNow.split('.');
    var timeTarget = '04.04.2019';
    var timeTargetSplit = timeTarget.split('.');

    var timeNowObj = new Date(timeNowSplit[2], timeNowSplit[1]-1, timeNowSplit[0]);
    var timeTargetObj = new Date(timeTargetSplit[2], timeTargetSplit[1]-1, timeTargetSplit[0]);

    difference = timeTargetObj - timeNowObj;
    console.log(difference);