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<>1、首先 获取当前时间或者自定义一个时间
// 获取系统当前时间 var nowDate = new Date() 输出结果：Thu Dec 09 2021 15:42:07 GMT+0800 (
中国标准时间) // 自定义时间 var diyDate = new Date('2021-12-12') 输出结果：Sun Dec 12 2021 08:00
:00 GMT+0800 (中国标准时间)
<>2、实例 日期加一天
// 自定义时间 var diyDate = new Date('2021-12-12') //加1天 date = new Date(diyDate.
setDate(diyDate.getDate() + 1)); // 拼接日期 yyyy-MM-dd 注意月份要 + 1 date = date.
getFullYear() + "-" + ((date.getMonth() + 1) > 9 ? date.getMonth() + 1 : "0" + (
date.getMonth() + 1)) + "-" + (date.getDate() > 9 ? date.getDate() : "0" + date.
getDate()); //结果 输出日期：2021-12-13
<>3、日期获取方法
getFullYear() 获取四位的年（yyyy） getMonth() 获取月（0-11） getDay() 以数值获取周名（0-6） getDate()
以数值返回天（1-31） getHours() 获取小时（0-23） getMinutes() 获取分（0-59） getSeconds() 获取秒（0-59
）getMilliseconds() 获取毫秒（0-999） getTime() 获取时间（从 1970 年 1 月 1 日至今）
<>4、日期设置方法
setFullYear() 设置年（可选月和日） setMonth() 设置月（0-11） setDate() 以数值（1-31）设置日 setHours()
设置小时（0-23） setMinutes() 设置分（0-59） setSeconds() 设置秒（0-59） setMilliseconds()
设置毫秒（0-999） setTime() 设置时间（从 1970 年 1 月 1 日至今的毫秒数）
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