如何建立在非全局语言环境中工作的“时刻”功能？

Question

With MomentJS, if necessary I can set a locale on a specific moment instance (rather than globally) using .locale (or .lang in older versions). How can I create a function equivalent to moment (all 42 signatures of it) that always works in a specific locale that's different from the global?

I have a submodule within a web project that has to work with a custom locale. We don't want this locale used outside this particular submodule, but we want it used consistently within that submodule. So I basically want a moduleMoment (or whatever) that I can call just like moment , but which works in the custom locale. Is there any built-in way to do that?

Note : I'm not talking about changing the locale of an existing instance, I'm talking about calling the moment function (in all its various different signatures) using a locale other than its global locale. So this won't work:

var m = moment(args).locale(localeId);

...because the args will be processed in the global locale, and then the locale gets changed on the instance after the fact, which is too late.

Answer 1

The only way I can find to do it is to have a function that temporarily sets the locale, calls moment , then sets the locale back to the previous one, like this:

function moduleMoment() {
    var prevLocaleId, m;

    prevLocaleId = moment.locale();
    try {
        moment.locale(customLocaleId);
        m = moment.apply(this, arguments);
        return m;
    } finally {
        moment.locale(prevLocaleId);
    }
}

Or one could add it to moment , like this:

moment.localized = function(locale) {
    var prevLocaleId, m, args;

    prevLocaleId = moment.locale();
    try {
        moment.locale(locale);
        m = moment.apply(this, Array.prototype.slice.call(arguments, 1));
        return m;
    } finally {
        moment.locale(prevLocaleId);
    }
};

Answer 2

Unfortuntately it doesn't seem like Moment supports this functionality. There is a new feature request in the GitHub issue tracker: https://github.com/moment/moment/issues/2291

You could write a function that forwards its arguments to the moment constructor and then applies the language you want.

Here's an example:

 function localizedMoment() { return moment.apply(null, arguments).locale("fr"); } 

If you need to allow a parameter, just use Array.prototype.slice :

 function localizedMoment(locale) { var args = Array.prototype.slice.call(locale, 1); return moment.apply(null, args).locale(locale); }