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嘗試刪除不允許的屬性時引發錯誤

JavaScript

慕哥9229398 2021-04-08 14:15:22

因此，我知道您可以通過將configurable對象的屬性設置為來防止屬性被刪除false。但是，您從此delete操作中獲得的唯一反饋是顯示為true或false的布爾值。當刪除不允許的屬性時，有什么方法可以立即引發錯誤？const obj = { deleteMe: "Some text", dontDeleteMe: "Some other text"};Object.defineProperty(obj, 'dontDeleteMe', { value: "Some text", writable : true, enumerable : true, configurable : false});console.log(Object.keys(obj));delete obj.deleteMe;console.log(Object.keys(obj));delete obj.dontDeleteMe;console.log(Object.keys(obj));

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3 回答

阿波羅的戰車

TA貢獻1862條經驗獲得超6個贊

如果添加，將引發錯誤use strict：

'use strict';

const obj = {

deleteMe: "Some text",

dontDeleteMe: "Some other text"

};

Object.defineProperty(obj, 'dontDeleteMe', {

value: "Some text",

writable : true,

enumerable : true,

configurable : false

});

console.log(Object.keys(obj));

delete obj.deleteMe;

console.log(Object.keys(obj));

delete obj.dontDeleteMe;

console.log(Object.keys(obj));

帶代理：

const obj = {

deleteMe: "Some text",

dontDeleteMe: "Some other text"

};

Object.defineProperty(obj, 'dontDeleteMe', {

value: "Some text",

writable : true,

enumerable : true,

configurable : false

});

const handler1 = {

deleteProperty(target, prop) {

delete target[prop];

if (target[prop]) {

throw new Error(`Invalid attempt to delete '${prop}' property`);

}

return true;

}

};

const proxyObj = new Proxy(obj, handler1);

console.log(Object.keys(proxyObj));

delete proxyObj.deleteMe;

console.log(Object.keys(proxyObj));

delete proxyObj.dontDeleteMe;

console.log(Object.keys(proxyObj));

反對回復 2021-04-22

回首憶惘然

TA貢獻1847條經驗獲得超11個贊

如果您不想使用“使用嚴格”（無論出于何種原因），這將是代理解決方案：

const obj = {

deleteMe: "Some text",

dontDeleteMe: "Some other text"

};

const deleteHandler = {

deleteProperty(target, prop) {

if (prop in target) {

const deleted = delete target[prop];

if (!deleted) {

console.error(`deletion not allowed: ${prop}`);

}

};

Object.defineProperty(obj, 'dontDeleteMe', {

value: "Some text",

writable: true,

enumerable: true,

configurable: false

});

const proxyObj = new Proxy(obj, deleteHandler);

console.log(Object.keys(proxyObj));

delete proxyObj.deleteMe;

console.log(Object.keys(proxyObj));

delete proxyObj.dontDeleteMe;

console.log(Object.keys(proxyObj));

反對回復 2021-04-22

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嘗試刪除不允許的屬性時引發錯誤

嘗試刪除不允許的屬性時引發錯誤

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