1.7 KiB
1.7 KiB
title, localeTitle
| title | localeTitle |
|---|---|
| Object Freeze | 对象冻结 |
对象冻结
Object.freeze()方法冻结了一个对象。冻结的对象会_阻止您_ ：
- 添加新属性
- 从中删除现有的特性
- 更改其现有属性的可枚举性，可配置性或可写性
句法
Object.freeze(obj)
参数
obj
- 要冻结的对象。
返回
冻结的物体。
重要的提示
尝试添加，删除或修改冻结对象的属性将导致失败。此失败将是静默或抛出TypeError （如果启用了严格模式）。另外， Object.freeze()是一个浅操作。这意味着冻结对象的嵌套对象是可修改的。
例
// Create your object
let person = {
name: 'Johnny',
age: 23,
guild: 'Army of Darkness',
hobbies: ['music', 'gaming', 'rock climbing']
}
// Modify your object
person.name = 'John'
person.age = 24
person.hobbies.splice(1,1)
delete person.guild
// Verify your object has been modified
console.log(person) // { name: 'John', age: 24, hobbies: ['music', 'rock climbing']
// Freeze your object
Object.freeze(person)
// Verify that your object can no longer be modified
person.name = 'Johnny' // fails silently
person.age = 23 // fails silently
console.log(person) // { name: 'John', age: 24, hobbies: ['music', 'rock climbing']
// The freeze is "shallow" and nested objects (including arrays) can still be modified
person.hobbies.push('basketball')
consol.log(person.hobbies) // ['music', 'rock climbing', 'basketball']