如何在JavaScript中创建其属性无法更改的对象的只读/不可变版本?这也应适用于任何子对象的属性,等等。
How can I create a read-only/immutable version of an object in JavaScript, whose properties cannot be changed? This this should also apply to the properties of any sub objects and so on.
我遇到的所有方法都可以做到这一点( Object.defineProperty , Object.freeze 等)仅适用于对象的顶级属性,而不适用于子对象。
All methods I have come across to do this (Object.defineProperty, Object.freeze, etc) work only for the top level properties of the object, but not for the sub-objects.
(一个可能的用例:在创建/修改设置或配置在特定模块中键入对象,则需要以不可变的形式将其公开给程序的其余模块。)
(A possible use case: After creating/modifying a settings or configuration type object in a specific module, you need to expose it to the rest of the program's modules in an immutable form.)
推荐答案这是我经过一番思考后想到的解决方案。可以很好地满足我的需求,所以我想分享一下QnA风格。 如果发现有任何改进/问题,请提出建议。
This is the solution I came up with after some thought. Works well for my needs so I thought I'd share it QnA style. Do suggest any improvements/issues if you you find them.
/** * Make the the specified object (deeply) immutable or "read-only", so that none of its * properties (or sub-properties) can be modified. The converted object is returned. * @param {object} obj Input object */ makeImmutable: function makeImmutable (obj) { if ((typeof obj === "object" && obj !== null) || (Array.isArray? Array.isArray(obj): obj instanceof Array) || (typeof obj === "function")) { Object.freeze(obj); for (var key in obj) { if (obj.hasOwnProperty(key)) { makeImmutable(obj[key]); } } } return obj; }编辑:简化了代码。现在也可以正确处理数组。
Simplified the code. Also handles arrays correctly now.
更多推荐
创建任何对象的只读/不可变副本(包括深层属性)
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