node.js 清除需要缓存
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Clearing require cache
提问by Ionic? Biz?u
I am trying to delete a module from cache as suggested here.
我正在尝试按照此处的建议从缓存中删除模块。
In the documentationwe read:
在我们阅读的文档中：
require.cache
- Object
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.
需要缓存
- 目的
模块在需要时缓存在此对象中。通过从此对象中删除一个键值，下一个 require 将重新加载模块。
So, I created a file named 1.jsthat contains a single line:
因此，我创建了一个名为的文件1.js，其中包含一行：
module.exports = 1;
Then I require it via nodeshell:
然后我通过nodeshell要求它：
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
So, why does require("./1")return 1when my file contains module.exports = 2and the cache is cleared?
那么，为什么不require("./1")返回1时，我的文件中包含module.exports = 2和清除缓存？
Doing some debugging I saw that there is a Module._cacheobject that is not cleared when I do require.cache = {}.
做一些调试我看到有一个Module._cache对象在我做的时候没有被清除require.cache = {}。
回答by vkurchatkin
require.cacheis 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 deletethem.
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。您需要迭代键，实际上是delete它们。
