While the hash history works well, it can be considered a bit of a hack because of its reliance on the storing all of the path information in the hash of a URL. Therefore, it should only be considered when your website does not have a dynamic server to server your HTML.
虽然 hash history 工作得很好，但是由于它依赖与将所有 location 信息保存在 URL 的 hash 中，因此可以认为这种方法有一点点 hack。所以当你的网站没有动态服务器来服务你的 HTML 时可以考虑这种方法。
> 虽然 hash history 工作得很好，但是由于它依赖与将所有 location 信息保存在 URL 的 hash 中，因此可以认为这种方法有一点点 hack。所以当你的网站没有动态服务器来服务你的 HTML 时可以考虑这种方法。
#### Memory: The Catch-all History
The best thing about memory location is that you can use it anywhere that you can run JavaScript.
关于 memory history 的最好的事情是你能在任何可以运行 JavaScript 的地方使用它。
> 关于 memory history 的最好的事情是你能在任何可以运行 JavaScript 的地方使用它。
A simple example is that you can use it in unit tests run via Node. That allows you to test code that relies on a history object without having to actually test with a browser.
一个简单的例子是你可以在 Node 中运行的单元测试中使用它。这允许你测试一些依赖 history 对象的代码而不必真的用一个浏览器来测试。
> 一个简单的例子是你可以在 Node 中运行的单元测试中使用它。这允许你测试一些依赖 history 对象的代码而不必真的用一个浏览器来测试。
More importantly, you can also use a memory history in mobile apps. A memory history is used by `react-router-native` to enable location based navigation in `react-native` apps.
更重要的是，你也可以在移动端 app 中使用它。memory history 被`react-router-native` 用于允许在`react-native`app中使用基于 location 的导航。
> 更重要的是，你也可以在移动端 app 中使用它。memory history 被`react-router-native` 用于允许在`react-native`app中使用基于 location 的导航。
If you really wanted, you could even use a memory history in the browser (although you would be losing the integration with the address bar).
The biggest difference between the memory history and the browser and hash histories is that it maintains its own in-memory array of locations. When creating a memory history you can pass information to setup the initial state. This state would be an array of locations and the index of the “current” location in that array [5]. This is different from the browser and hash histories, which rely on the browser to already be storing the array of locations.
