Javascript 在javascript中设置星期几
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setting day of week in javascript
提问by pedalpete
I'm using the phonegap localNotifications plugin which specifies that I can set a notification to occur weekly.
我正在使用 phonegap localNotifications 插件，它指定我可以设置每周发生一次通知。
However, it appears the javascript date object only has .getDay()and not .setDay().
但是，似乎 javascript 日期对象只有.getDay()而没有.setDay().
I've got an json object of the days of the week I want to set to repeat,
我有一个我想设置为重复的一周中的几天的 json 对象，
set_days = {"mon":false, "tues":true,"wed":false,"thurs":true...}
how do you set a day in javascript? Because it is setting a notification, the day has to be in the future, so I don't want to get the most recent "wednesday", but only the next "wednesday".
你如何在javascript中设置一天？因为是设置通知，那一天必须在未来，所以我不想得到最近的“星期三”，而只想得到下一个“星期三”。
here's a link to the plugin, but I don't think this is really specific to the plugin.
这是插件的链接，但我认为这不是插件特有的。
回答by Bergi
how do you set a day in javascript?
你如何在javascript中设置一天？
You mean, in the current week? When does a week start?
你是说，在本周？一周什么时候开始？
Assuming it starts on Sunday (as in getDay: 0 - Sunday, 1 - Monday, etc), this will work:
假设它从星期日开始（如getDay：0 - 星期日、1 - 星期一等），这将起作用：
var date, daytoset; // given: a Date object and a integer representing the week day
var currentDay = date.getDay();
var distance = daytoset - currentDay;
date.setDate(date.getDate() + distance);
To set the date to a weekday in the next 7 days, use this:
要将日期设置为接下来 7 天的工作日，请使用以下命令：
var distance = (daytoset + 7 - currentDay) % 7;
回答by Arthur
This is an answer already well completed but I found a solution that I want to share with you.
这是一个已经完成的答案，但我找到了一个我想与您分享的解决方案。
I'm not adept of updating JS object like Date, so I did not provide a complete solution to implement Date.proptype.setDaybut the idea is here:
我不擅长更新像 Date 这样的 JS 对象，所以我没有提供完整的解决方案来实现，Date.proptype.setDay但想法在这里：
// Get a day of the current week
// Example "Get Monday" : getWeekDay({day:1})
// Args:
// - day {Number} Same format that Date.getDay() > Sunday - Saturday : 0 - 6
// - inWeeks {Number} Number of week relative to current, -1: Previous week, 1: Next week, 2: in 2 weeks
// - date {Date} Use this date instead of now to get relative current week
// - atMidnight {Bool} Force result date to be at 00:00:00:00 (instead of keeping current/date time)
/*export*/ const getWeekDay = ({
day, inWeeks=0,
date,
atMidnight=false, // Force days to be at 00:00:00:00
}={}) => {
date = date ? new Date(date) : new Date(); // Loose ref if exist, or take now
day = (typeof day !== 'number' && typeof day !== 'string')
? date.getDay()
: day;
date.setDate(date.getDate() + inWeeks * 7 + (day - date.getDay()));
if (atMidnight) {
date.setHours(0,0,0,0);
}
return date;
};
// Same that getWeekDay
// but return an array of all days in the week [Sunday, Monday, .. Saturday]
// Instead of one single day
// Additional Args:
// - days: Array of day: {Number} Same format that Date.getDay() > Sunday - Saturday : 0 - 6
/*export*/ const getWeekDays = ({
days = [ ...Array(7).keys() ],
...args
}) => days.map(day => getWeekDay({...args, day}));
// Demo:
let wed = getWeekDay({inWeek:1, day:3})
console.log("The next Wednesday is: " + wed);
console.log("The next one (at midgnight): " + getWeekDay({date: wed, inWeeks:1, atMidnight:true}));
console.log("All days 2 weeks ago: " + getWeekDays({inWeeks:-2}));
console.log("Only Monday and Wednesday next week: " + getWeekDays({inWeeks:1, days:[1,3]}));Additional Note
附加说明
If you really DON'Twant to loose ref and update the dateyou send as arg you can replace this line:
如果你真的不要想松ref和更新date您发送的精氨酸可以替换此行：
date = date ? new Date(date) : new Date(); // Loose ref if exist, or take now
date = date ? new Date(date) : new Date(); // Loose ref if exist, or take now
by:
经过：
date = date ? date : new Date(); // KEEP ref if exist in order to update original, or take now
date = date ? date : new Date(); // KEEP ref if exist in order to update original, or take now
回答by Preston
Are you creating a new date object to set on?
您是否正在创建要设置的新日期对象？
var d = new Date();
d.setDate(11);
would result in
会导致
Tue Aug 14 2012 00:31:56 GMT-0500 (Central Daylight Time)
The date object does have a set method.
日期对象确实有一个 set 方法。
http://www.tutorialspoint.com/javascript/javascript_date_object.htm
http://www.tutorialspoint.com/javascript/javascript_date_object.htm
