Javascript 在两个日期内生成随机日期数组的优雅方法
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Elegant method to generate array of random dates within two dates
提问by mplungjan
I have a datepicker where I show two months and I want to randomly choose 3 dates in each visible month
我有一个显示两个月的日期选择器，我想在每个可见的月份随机选择 3 个日期
$('.date').datepicker({
minDate: new Date(),
dateFormat: 'DD, MM, d, yy',
constrainInput: true,
beforeShowDay: processDates,
numberOfMonths: 2,
showButtonPanel: true,
showOn: "button",
buttonImage: "images/calendar_icon.jpg",
buttonImageOnly: true
});
Here is my calculation
这是我的计算
var now = new Date();
var nowTime = parseInt(now.getTime()/1000);
var randomDateSet = {};
function getRandomSet(y,m) {
var monthIndex = "m"+y+""+m; // m20121 for Jan
if (randomDateSet[monthIndex]) return randomDateSet[monthIndex];
// generate here
.
. - I need this part
.
return randomDateSet[monthIndex];
}
function processDay(date) { // this is calculated for each day so we need a singleton for the array
var dateTime = parseInt(date.getTime()/1000);
if (dateTime <= (nowTime-86400)) {
return [false]; // earlier than today
}
var m = date.getMonth(), d = date.getDate(), y = date.getFullYear();
var randomDates = getRandomSet(y,m);
for (i = 0; i < randomDates.length; i++) {
if($.inArray((m+1) + '-' + d + '-' + y,randomDates) != -1 || new Date() > date) {
return [true,"highlight","Some message"];
}
}
return [true,"normal"]; // ordinary day
}
回答by Tomasz Nurkiewicz
Maybe I am missing something, but isn't this it?
也许我错过了一些东西，但这不是吗？
function randomDate(start, end) {
return new Date(start.getTime() + Math.random() * (end.getTime() - start.getTime()));
}
randomDate(new Date(2012, 0, 1), new Date())
回答by Demven Weir
new Date(+(new Date()) - Math.floor(Math.random()*10000000000))
回答by SoEzPz
Using Moment.js&& @Demven Weir'sanswer to get a string value like "03/02/1975".
使用Moment.js&& @Demven Weir 的答案来获得像“03/02/1975”这样的字符串值。
moment(new Date(+(new Date()) - Math.floor(Math.random()*10000000000)))
.format('MM/DD/YYYY');
NOTE:Keep adding a zero at a time to increase the span of years produced.
注意：继续一次添加一个零以增加生产年份的跨度。
回答by bububaba
You can convert the boundary dates to integers (Date.getTime()) and then use Math.random()to generate your random dates within given boundaries. Then go back to Dateobjects with Date.setTime().
您可以将边界日期转换为整数 ( Date.getTime())，然后用于Math.random()在给定边界内生成随机日期。然后返回到Date带有 的对象Date.setTime()。
