检查日期是否在范围内

问题描述：

我正在尝试检查mm.dd.yyyy格式的日期是否大于今天，并且小于今天的6个月后的日期。

I am trying to check if a date of format mm.dd.yyyy is greater than today and less than the date after 6 months from today.

这里是我的代码：

var isLinkExpiryDateWithinRange = function(value) {
    var monthfield = value.split('.')[0];
    var dayfield = value.split('.')[1];
    var yearfield = value.split('.')[2];
    var inputDate = new Date(yearfield, monthfield - 1, dayfield);
    var today = new Date();     
    today = new Date(today.getFullYear(), today.getMonth(), today.getDate());
    alert(inputDate > today);//alert-> true
    var endDate = today;
    endDate.setMonth(endDate.getMonth() + 6);
    alert(inputDate > today);//alert-> false
    if(inputDate > today && inputDate < endDate) {
        alert('1');
    } else {
        alert('2');/always alert it
    }
}

如果我执行 isLinkExpiryDateWithinRange（'12 .08.2012'），我希望它显示1，因为它在范围内，但是它显示2。此外，第一个警报显示为true，第二个警报显示为false。

If I execute isLinkExpiryDateWithinRange('12.08.2012') I wish it will show 1 as this is within the range, but it is displaying 2. Moreover the first alert is showing true and the second one false.

有人可以解释发生了什么吗？

Can anyone please explain what is happening?

答

更改：

var endDate = today;

至：

var endDate = new Date(today);

查看帖子通过引用或值值通过语言，以了解如何引用和更改对象。有一些非常好的例子可以帮助解释这个问题，尤其是：

See the posts here for how objects are referenced and changed. There are some really good examples that help explain the issue, notably:

相反，情况是传入的项目是按值传递的。
但是按值传递的项目本身就是引用。

Instead, the situation is that the item passed in is passed by value. But the item that is passed by value is itself a reference.

JSFiddle示例

检查日期是否在范围内

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