JavaScript Date setHours()

const d = new Date();
d.setHours(15);

描述

setHours()设置日期的小时。

setHours()还可以设置分、秒和毫秒。

将时间设置为 15:35:01

const d = new Date();
d.setHours(15, 35, 1);

将时间设置为48小时前:

const d = new Date();
d.setHours(d.getHours() - 48);

setHours()是 ECMAScript1 (ES1) 功能。

所有浏览器均完全支持 ES1 (JavaScript 1997)：


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

Date.setHours( hour, min, sec, millisec)

hour	Required. The Hours. 0 to 23, but other values are allowed: -1 gives the last hour of the previous day 24 gives the first hour of the next day
min	Optional. The Minutes. 0 to 59, but other values are allowed: -1 gives the last minute of the previous hour 60 gives the first minute of the next hour
sec	Optional. The seconds. 0 to 59, but other values are allowed: -1 gives the last second of the previous minute 60 gives the first second of the next minute
millisec	Optional. The milliseconds. 0 to 999, but other values are allowed: -1 gives the last millisecond of the previous second 1000 gives the first millisecond of the next second

一个号码。

该日期与 1970 年 1 月 1 日 00:00:00 UTC 之间的毫秒数。