如何在 JS 中“深冻结”对象?
如果咱们想要确保对象被深冻结,就必须创建一个递归函数来冻结对象类型的每个属性:
没有深冻结
let person = { name: "Leonardo", profession: { name: "developer" } }; Object.freeze(person); person.profession.name = "doctor"; console.log(person); //output { name: 'Leonardo', profession: { name: 'doctor' } }
深冻结
function deepFreeze(object) { let propNames = Object.getOwnPropertyNames(object); for (let name of propNames) { let value = object[name]; object[name] = value && typeof value === "object" ? deepFreeze(value) : value; } return Object.freeze(object); } let person = { name: "Leonardo", profession: { name: "developer" } }; deepFreeze(person); person.profession.name = "doctor"; // TypeError: Cannot assign to read only property 'name' of object
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码云笔记 » 如何在 JS 中“深冻结”对象?
码云笔记 » 如何在 JS 中“深冻结”对象?