我如何在moment.js中解决可变性问题？ [英] How do I work around mutability in moment.js?

问题描述

我遇到了一个问题，我必须存储一个时刻对象的初始值，但是我遇到了一些问题，我的变量不能随原始对象一起变化。

I've run into a problem where I have to store the initial values of a moment object but I'm having some trouble preventing my variable from changing along with the original object.

不幸的是，Object.freeze（）不起作用，因为当我尝试格式化时，moment.js返回无效日期错误。

Unfortunately Object.freeze() doesn't work, because moment.js returns an "Invalid date" error when I try to format that.

推荐答案

NPM上有一个名为冻结时刻的Moment.js插件 - 您可以使用 moment（）。freeze（）代替 Object.freeze（moment（）） 。

There's a Moment.js plugin on NPM called frozen-moment - You could use moment().freeze() in place of Object.freeze(moment()).

否则，vanilla Moment.js有一个 clone 方法，它可以帮助你避免可变性问题，所以你可以做这样的事情：

Otherwise, vanilla Moment.js has a clone method that should help you avoid mutability problems, so you could do something like this:

var a = moment(),
    b = a.clone(); // or moment(a)

更新：

我写这个答案已经两年了。在这个时候，另一个处理日期的图书馆浮出水面并获得了很大的吸引力： https://date-fns.org /

It has been two years since I wrote this answer. In this time, another library for working with dates has surfaced and gained a lot of traction: https://date-fns.org/

这个库默认是不可变的，遵循模块化的功能架构，这意味着它更适合树摇动和客户端捆绑。如果您正在开发一个在客户端广泛使用Webpack的项目，并发现Moment.js给您的构建带来麻烦，或者即使Moment.js的可变性让您头疼，那么您应该尝试 date-fns 。

This library is immutable by default and follows a modular, functional architecture, which means it is better suited to tree shaking and client-side bundling. If you are working on a project that makes extensive use of Webpack on the client side, and find that Moment.js is giving you trouble with your build, or even if Moment.js' mutability is causing you a lot of headache, then you should give date-fns a try.

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