在nodejs程序中使用timezone-js [英] Using timezone-js in nodejs program

问题描述

以下是我编写的代码，使用 timezone-js 模块为特定时区创建 Date 对象

Here is the code that I wrote to use timezone-js module to create Date object for a specific timezone

require('timezone-js');
var dt = new timezoneJS.Date('2012, 06, 8, 11, 55, 4','Europe/Amsterdam');

我跑 npm install timezone-js 和安装模块。

然而，当我运行程序时，我收到以下错误

However , when I run the program, I get the following error

var dt = new timezoneJS.Date('2012, 06, 8, 11, 55, 4','Europe/Amsterdam');
             ^
ReferenceError: timezoneJS is not defined
at Object.<anonymous> (/Users/nandish/Documents/MI-Airlines/mi.airline-sync/lib/nodeTest.js:47:15)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)

推荐答案

当您使用 require 时，您将结果分配给变量，然后使用该变量。所以：

When you use require, you assign the result to a variable, and then use that variable. So:

var timezoneJS = require('timezone-js');

除此之外，这意味着你可以使用你想要的任何名称，例如：

Amongst other things, this means that you can use whatever name you want, for instance:

var ts = require('timezone-js');
var dt = new ts.Date(2013, 0, 1);

---

附注：请务必阅读 timezone-js 的设置要求你打算用它。它需要区域文件，如果您不提供它们，它将尝试动态加载。我试过的版本有错误检测可用的传输，FWIW（它试图读取它不知道定义的全局符号，这会引发异常，而不是使用 typeof thesymbol 哪个没有）。

---

Side note: Be sure to read about the setup requirements for timezone-js if you're going to use it. It needs zone files, which it will try to load dynamically if you don't supply them. The version I tried out has bugs detecting what transport is available, FWIW (it tries to read a global symbol it doesn't know is defined, which throws an exception, rather than using typeof thesymbol which doesn't).

如果您主动抓取该链接中描述的时区文件，并且它们位于相对路径 tz 从您运行脚本的位置开始，这可行：

If you proactive grab the timezone files as described in that link, and they're in the relative path tz from where you're running your script, this works:

var timezoneJS = require("timezone-js");
var fs = require('fs');

// Give timezoneJS a transport for loading local timezone files.
// This code is extracted from https://github.com/mde/timezone-js/blob/master/spec/test-utils.js
timezoneJS.timezone.transport = function (opts) {
  // No success handler, what's the point?
  if (opts.async) {
    if (typeof opts.success !== 'function') return;
    opts.error = opts.error || console.error;
    return fs.readFile(opts.url, 'utf8', function (err, data) {
      return err ? opts.error(err) : opts.success(data);
    });
  }
  return fs.readFileSync(opts.url, 'utf8');
};

// Init timezones
timezoneJS.timezone.zoneFileBasePath = 'tz'; // <== If you put the files elsewhere, change this
timezoneJS.timezone.init();

// Use it to get a date in Central European Time
var d = new timezoneJS.Date(2013, 7, 1, 'CET');
console.log(d.toString());      // "Local" time for the date instance (CET)
console.log(d.toUTCString());   // UTC

...当然，您可以使用使用HTTP加载它们的传输。我很惊讶 npm - -packaged版本的 timezone-js 不会默认为某些基于文件的传输而不是寻找图书馆（破损检查）。

...or of course you can use a transport that uses HTTP to load them. I'm surprised the npm--packaged version of timezone-js doesn't default to some file-based transport rather than looking for libraries (with the broken check).

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