清除需要缓存

问题描述

我正在尝试按照此处的建议从缓存中删除模块.

I am trying to delete a module from cache as suggested here.

在文档中，我们阅读了:

• 对象

模块在需要时缓存在这个对象中.通过从此对象中删除一个键值，下一个 require 将重新加载模块.

Modules are cached in this object when they are required. By deleting a key value from this object, the next require will reload the module.

因此，我创建了一个名为 1.js 的文件，其中包含一行:

So, I created a file named 1.js that contains a single line:

module.exports = 1;

然后我通过 node shell 要求它:

Then I require it via node shell:

ionicabizau@laptop:~/Documents/test$ node
> require("./1")
1
> require.cache
{ '/home/ionicabizau/Documents/test/1.js':
   { id: '/home/ionicabizau/Documents/test/1.js',
     exports: 1,
     parent:
      { id: 'repl',
        exports: [Object],
        parent: undefined,
        filename: '/home/ionicabizau/Documents/test/repl',
        loaded: false,
        children: [Object],
        paths: [Object] },
     filename: '/home/ionicabizau/Documents/test/1.js',
     loaded: true,
     children: [],
     paths:
      [ '/home/ionicabizau/Documents/test/node_modules',
        '/home/ionicabizau/Documents/node_modules',
        '/home/ionicabizau/node_modules',
        '/home/node_modules',
        '/node_modules' ] } }
# edited file to export 2 (module.exports = 2;)
> require.cache = {}
{}
> require.cache
{}
> require("./1") // supposed to return 2
1

那么，当我的文件包含 module.exports = 2 时，为什么 require("./1") 返回 1缓存被清除了吗?

So, why does require("./1") return 1 when my file contains module.exports = 2 and the cache is cleared?

在做一些调试时我看到有一个 Module._cache 对象在我执行 require.cache = {} 时没有被清除.

Doing some debugging I saw that there is a Module._cache object that is not cleared when I do require.cache = {}.

推荐答案

require.cache 只是一个暴露的缓存对象引用，这个属性不是直接使用的，所以改变它没有任何作用.您需要遍历键并实际删除它们.

require.cache is just an exposed cache object reference, this property is not used directly, so changing it does nothing. You need to iterate over keys and actually delete them.

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