如何使用 JavaScript 查找下个月和上个月？
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How to find the next and previous months with JavaScript?
提问by user2354302
My jQuery function takes in the current month. I would like to display the next and previous months depending on the buttons clicked.
我的 jQuery 函数接受current month. 我想根据单击的按钮显示下个月和上个月。
My question is, is there a defaultDate()function I can call to know the next and previous months of a current month ?
我的问题是，有没有defaultDate()我可以调用的函数来了解当前月份的下个月和上个月？
$(document).ready(function () {
var current_date = $('#cal-current-month').html();
//current_date will have September 2013
$('#previous-month').onclick(function(){
// Do something to get the previous month
});
$('#next-month').onclick(function(){
// Do something to get the previous month
});
});
I can write some code and get the next and previous months, but I was wondering if there is any already defined functionsfor this purpose?
我可以编写一些代码并获得下个月和上个月的数据，但我想知道是否已经defined functions有用于此目的的代码？
SOLVED
解决了
var current_date = $('.now').html();
var now = new Date(current_date);
var months = new Array( "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
$('#previous-month').click(function(){
var past = now.setMonth(now.getMonth() -1);
$('.now').html(months[now.getMonth()]+' '+now.getFullYear());
});
$('#next-month').click(function(){
var future = now.setMonth(now.getMonth() +1);
$('.now').html(months[now.getMonth()]+' '+now.getFullYear());
});
回答by Daniel Bank
If you just want to get the first day of the next month, you could do something like:
如果您只想获得下个月的第一天，您可以执行以下操作：
var now = new Date();
var future = now.setMonth(now.getMonth() + 1, 1);
var past = now.setMonth(now.getMonth() - 1, 1);
This will prevent the "next" month from skipping a month (e.g. adding a month to January 31, 2014 will result in March 3rd, 2014 if you omit the second parameter).
这将防止“下一个”月份跳过一个月（例如，如果省略第二个参数，将一个月添加到 2014 年 1 月 31 日将导致 2014 年 3 月 3 日）。
As an aside, using date.js* you could do the following:
var today = Date.today();
var past = Date.today().add(-1).months();
var future = Date.today().add(1).months();
In this example I am using today's date, but it works for any date.
在这个例子中，我使用今天的日期，但它适用于任何日期。
*date.js has been abandoned. If you decide to use a library, you should probably use moment.js as RGraham suggests.
*date.js 已被放弃。如果你决定使用一个库，你应该像 RGraham 建议的那样使用 moment.js。
