javascript - 尝试将 getDate() 包含在 var 中

Question

有人可以帮助我理解为什么这不起作用？

    document.write('messing with the dates: <br>')
    var nowDate = new Date();
    var currentDay = nowDate.getDate();
    nowDate.setDate(currentDay + 1);
    document.write('if it\'s not inside a variable, it\'s nice and tidy: ' + nowDate.getDate() + '<br>');

    var tomorrow = (nowDate.setDate(currentDay + 1));
    document.write('but as soon as I put it inside a var, it becomes terrible: ' + tomorrow);

    document.write('and this is not even working' + tomorrow.getDate());

Answer 1

setDate 执行两件事，更改日期对象本身，并返回结果日期自 1970 年 1 月 1 日 00:00:00 UTC 以来的毫秒数。

这是您明天收到的号码

我想你应该像这样使用它来实现你想要做的事情:

var tomorrow = new Date((nowDate.setDate(currentDay + 1)))