用于获取上周一的Java语言 [英] Javascript for getting the Previous Monday

问题描述

我希望上一个星期一出现在用户输入今天日期的字段中。

I would like for the previous Monday to appear in the field where a user enters today's date.

例如：如果输入了今天的日期 16.Jan-16 ，那么代码将改为显示上周一的日期（即 16-Jan-16 ）。

E.g.: If today's date is entered 29-Jan-16 then the code would make the previous Monday's date to appear instead (which would be 25-Jan-16).

我在网上看到了一些代码：

I have seen some code online:

function getPreviousMonday()
{
    var date = new Date();
    if(date.getDay() != 0)
        return new Date().setDate(date.getDate()-7-6);
    else
        return new Date().setDate(date.getDate()-date.getDate()-6);
}

但是，这不太可行，为什么？

However, this is not quite working, why?

推荐答案

我认为您的数学知识还差一点，我整理了您的语法；

I think your maths is just a little off, and I tidied your syntax;

function getPreviousMonday()
{
    var date = new Date();
    var day = date.getDay();
    var prevMonday;
    if(date.getDay() == 0){
        prevMonday = new Date().setDate(date.getDate() - 7);
    }
    else{
        prevMonday = new Date().setDate(date.getDate() - day);
    }

    return prevMonday;
}

这样，您总是可以看到发生的最后一个星期一（7天前如果今天是星期一）

That way you always get the last monday that happened (which is 7 days ago if today is monday)

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