ES5 中 Object.freeze 的效果可以逆转吗？

发布于 2024-12-05 02:21:18 字数 98 浏览 0 评论 0原文

一旦我这样做：

var x = { };
Object.freeze( x );

有什么方法可以修改x吗？谢谢。

原文

Once I do this:

var x = { };
Object.freeze( x );

Is there any way to modify x?
Thanks.

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星軌x 2024-12-12 02:21:18

不能向冻结的属性集中添加或删除任何内容
目的。任何这样做的尝试都会失败，无论是默默地还是通过抛出
TypeError 异常（最常见，但并非唯一，当在
严格模式）。

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects /Object/freeze

你可以这样想：

if( typeof ChuckNorris === 'undefined' ) {
    ChuckNorris = Object.create( [Infinity], {
        canCountTo: {
            value: Infinity * 2,
            writable: true,
            configurable: true
        }
    });

    Object.freeze( ChuckNorris ); // nothing can harm Chuck anymore !
}

console.log( ChuckNorris.canCountTo );  // Infinity
delete ChuckNorris.canCountTo;
console.log( ChuckNorris.canCountTo );  // Infinity

所以基本上，freeze 会将对象的 writable 和 configurable 标志设置为创建后为 false。

Nothing can be added to or removed from the properties set of a frozen
object. Any attempt to do so will fail, either silently or by throwing
a TypeError exception (most commonly, but not exclusively, when in
strict mode).

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/freeze

You can think about it like this:

if( typeof ChuckNorris === 'undefined' ) {
    ChuckNorris = Object.create( [Infinity], {
        canCountTo: {
            value: Infinity * 2,
            writable: true,
            configurable: true
        }
    });

    Object.freeze( ChuckNorris ); // nothing can harm Chuck anymore !
}

console.log( ChuckNorris.canCountTo );  // Infinity
delete ChuckNorris.canCountTo;
console.log( ChuckNorris.canCountTo );  // Infinity

So basically, freeze will set the objects writable and configurable flags to false after creation.

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