结论:Object.getOwnPropertyNames()遍历自身的非Symbol属性,不考虑是否可枚举,getOwnPropertyNames中的Own表示遍历自身属性,PropertyNames表示只遍历普通属性,不遍历Symbol。 Object.getOwnPropertySymbols() // console.log(Object.getOwnPropertySymbols(obj)); // 输出: // [Symbol(g), Symbol(i)] 1. 2. 3. 以上...
function traverseObject(obj: any) { const stack = [obj]; while (stack.length > 0) { const currentObj = stack.pop(); for (let key in currentObj) { if (typeof currentObj[key] === 'object' && currentObj[key] !== null) { stack.push(currentObj[key]); // 将子属性入栈 } else...
log(result); // ['key2', 'value2'] 在上面的示例中,我们首先定义了一个包含键/值对的对象obj。然后,我们定义了要搜索的键searchKey。接下来,我们使用Object.entries()方法将对象转换为键/值对的数组,并使用find()方法在数组中查找与searchKey匹配的键/值对。最后,我们将结果打印到...
propertyKey: string | symbol ) => void; 属性装饰器顾名思义,用来装饰类的属性。它接收两个参数: target: Object - 被装饰的类 propertyKey: string | symbol - 被装饰类的属性名 趁热打铁,马上来个例子热热身: function logProperty(target: any, key: string) { delete target[key]; const backingFiel...
{// 要求所有 `from` 中的 key 都存在于 `to` 中constallKeyExists=Object.keys(from).every(key=>!!to[key])// 要求 `from` 中的 key 长度和 `to` 一致constkeySizeEqual=(Object.keys(from).length===Object.keys(to).length)// 仅当同时满足上面两条时才通过校验if(!(allEeyExists&&keySize...
type MY_TYPE_OBJECT = { [key in MY_KEYS]: string } And using interface does not work: interface MY_INTERFACE_OBJECT { [key in MY_KEYS]: string } Error that I get: And the weirdest thing is that this works just fine (when [key in MY_KEYS] is nested):...
const base = { age: 20, skill: 'TS', } const person = { name: 'Frankie', } // 给 person 动态添加属性 for (const key in base) { if (Object.prototype.hasOwnProperty.call(base, key)) { person[key] = 'any value' // string、number、function etc. } } // 请问有什么办法,可以...
How do I determine if a class's name exists as a key in a mapped object type? I have a type that I'm trying to make dynamic. I currently have a hardcoded version that looks like this: importtype {Text,TextOptions, }from'pixi.js'exporttypeConstructorParams<Text...
1interface StringObject {2[key:string]:string3}4let myObj : StringObject ={5'name':'他乡踏雪',6'professional':'Web front end'7} 3.3字符串和数字两种索引签名组合使用: 这种复杂的接口应用在官方文档中只给出了一个引导性的示例,官方使用了文字描述使用方法,而示例只给出了错误使用提示,并没有给完...
functionisKey<T extends object>(x: T,k: PropertyKey): kiskeyof T {returnkinx;}keys.forEach((key)=>{if(isKey(user,key)){ console.log(user[key]);// key现在被缩小为 "name" | "age"} }); 1. 2. 3. 4. 5. 6. 7.