JavaScript时间对象之常用方法的设置实例

var time = new Date()
console.log(time) //Thu Sep 30 2021 14:24:27 GMT+0800 (中国标准时间)
time.setFullYear(2019)
console.log(time) //Mon Sep 30 2019 14:24:27 GMT+0800 (中国标准时间)

var time = new Date()
console.log(time) //Thu Sep 30 2021 14:33:33 GMT+0800 (中国标准时间)
time.setMonth(11)
console.log(time) //Thu Dec 30 2021 14:33:33 GMT+0800 (中国标准时间)

var time = new Date()
console.log(time) //Thu Sep 30 2021 14:33:33 GMT+0800 (中国标准时间)
time.setDate(11)
console.log(time) //Sat Sep 11 2021 14:39:03 GMT+0800 (中国标准时间)

var time = new Date()
console.log(time) //Thu Sep 30 2021 14:33:33 GMT+0800 (中国标准时间)
time.setHours(22)
console.log(time) //Thu Sep 30 2021 22:45:59 GMT+0800 (中国标准时间)

var time = new Date()
console.log(time) //Thu Sep 30 2021 14:33:33 GMT+0800 (中国标准时间)
time.setMinutes(45)
console.log(time) //Thu Sep 30 2021 14:45:52 GMT+0800 (中国标准时间)

var time = new Date()
console.log(time) //Thu Sep 30 2021 14:33:33 GMT+0800 (中国标准时间)
time.setSeconds(55)
console.log(time) //Thu Sep 30 2021 14:52:55 GMT+0800 (中国标准时间)

var time = new Date()
console.log(time) //Thu Sep 30 2021 14:33:33 GMT+0800 (中国标准时间)
time.setMilliseconds(1000)
console.log(time.setMilliseconds(1000)) //1632985218000

var time = new Date()
console.log(time) //Thu Sep 30 2021 14:33:33 GMT+0800 (中国标准时间)
time.setTime(1632985218000)
console.log(time) //Thu Sep 30 2021 15:00:18 GMT+0800 (中国标准时间)
time.setTime(2000)
console.log(time);//Thu Jan 01 1970 08:00:02 GMT+0800 (中国标准时间)

// 时间对象的其它方法
var time = new Date();
console.log(time); // Tue Feb 21 2023 15:10:38 GMT+0800 (中国标准时间)
console.log(time.()); // Tue Feb 21 2023 15:10:38 GMT+0800 (中国标准时间)
console.log(time.toLocaleString()); // 2023/2/21 15:10:38
console.log(time.toDateString()); // Tue Feb 21 2023
console.log(time.toLocaleDateString()); // 2023/2/21
console.log(time.toTimeString()); // 15:10:38 GMT+0800 (中国标准时间)
console.log(time.toLocaleTimeString()); // 15:10:38
console.log(time.valueOf()); // 1676963438332

// 静态方法
console.log(Date.now()) // 1676963759879
console.log(Date.parse('2023/2/20 12:00:00')); // 1676865600000
console.log(Date.parse('2023-2-20 12:00:00')); // 1676865600000

// 定一两个时间
var time = new Date()
var time1 = new Date('2021-11-23 00: 00: 00')
// 既然要分装成一个函数 就要先定义一个函数
function diffTime(time, time1) {
    // 定义一个空对象
    var obj = {}
    // 首先我们要拿到传进来的两个时间 但是我们不知道那个是大一点儿的时间 那个是小一点儿的时间
    var subMs = Math.abs(time - time1)
    // 这里我们先把毫秒转成秒
    var sub = Math.ceil(subMs / 1000)
    // 计算我们有多少天 多少小时多少分钟和多少秒
    var day = parseInt(sub / (24 * 60 * 60))
    var hours = parseInt(sub % (24 * 60 * 60) / (60 * 60))
    var minutes = parseInt(sub % (60 * 60) / 60)
    var seconds = sub % 60
    // 接下来就是把我们拿到的添加到对象里面
    obj.day = day
    obj.hours = hours
    obj.minutes = minutes
    obj.seconds = seconds
    // 最后我们要把这个空对象返回出去
    return obj
}
// 首次代码优化
var time1 = new Date()
var time2 = new Date('2021-12-12 00:00:00')
function diffTime(time1, time2) {
    var obj = {}
    var subMs = Math.abs(time1 - time2)
    var sub = Math.ceil(subMs / 1000)
    var day = parseInt(sub / (24 * 60 * 60))
    var hours = parseInt(sub % (24 * 60 * 60) / (60 * 60))
    var minutes = parseInt(sub % (60 * 60) / 60)
    var seconds = sub % 60
    obj.day = day
    obj.hours = hours
    obj.minutes = minutes
    obj.seconds = seconds
    return obj
}
// 使用
var res = diffTime(time, time1)
console.log(res);
// 再次代码优化
var time1 = new Date()
var time2 = new Date('2021-12-12 00:00:00')
function diffTime(time1, time2) {
    var sub = Math.ceil(Math.abs(time1 - time2) / 1000)
    return {
        day: parseInt(sub / (24 * 60 * 60)),
        hours: parseInt(sub % (24 * 60 * 60) / (60 * 60)),
        minutes: parseInt(sub % (60 * 60) / 60),
        seconds: sub % 60
    }
}
// 使用
var res = diffTime(time1, time2)
console.log(res);
// 代码优化
function diffTime(time, time1) {
    var sub = Math.ceil(Math.abs(time - time1) / 1000)
    return obj = {
        day: parseInt(sub / (24 * 60 * 60)),
        hours: parseInt(sub % (24 * 60 * 60) / (60 * 60)),
        minutes: parseInt(sub % (60 * 60) / 60),
        seconds: sub % 60
    }
}
var res = diffTime(time, time1)
console.log(res);