const descriptors = Object.getOwnPropertyDescriptors(p1) console.log(descriptors) /** 获取了全部的描述信息,然后再一个新对象上定义过去,这样才能全部拷贝过去 { firstName: { value: 'Lei', writable: true, enumerable: true, configurable: true }, lastName: { value: 'Wang', writable: true, enumer...
JavaScript 組件: System.Runtime.InteropServices.JavaScript.dll typeof()傳回 屬性。 C# 複製 public string GetTypeOfProperty (string propertyName); 參數 propertyName String 屬性的名稱。 傳回 String 其中一個 “undefined”、“object”、“boolean”、“number”、“bigint”...
Object.getOwnPropertyDescriptor() 静态方法返回一个对象,该对象描述给定对象上特定属性(即直接存在于对象上而不在对象的原型链中的属性)的配置。返回的对象是可变的,但对其进行更改不会影响原始属性的配置。
Javascript detect values from an object 1 2 3 4 5 6 let obj = { name: "Porter", age: 32 }; const vals = Object.keys(obj).map(key => obj[key]); console.log(vals); Run > Reset The ECMAScript 2015 specification introduces Symbol, instances of which can be used as property names...
与Object.getOwnPropertyNames() 类似,你可以将给定对象的所有符号属性作为 Symbol 数组获取。请注意,Object.getOwnPropertyNames() 本身不包含对象的 Symbol 属性,只包含字符串属性。 因为所有的对象在初始化的时候不会包含任何自有的 Symbol 属性,除非你在对象上分配了 Symbol 属性,否则 Object.getOwnPropertySymbols() ...
getOwnPropertyDescriptors(object1); const descriptors2 = Object.getOwnPropertyDescriptors(object2); console.log(descriptors1.property1.writable); console.log(descriptors1.property1.value,descriptors2.property2.value); 输出: true 42 23 相关用法 JavaScript Object.getOwnPropertyDescriptor()用法及代码...
The getOwnPropertyDescriptor() method returns a property descriptor for a specific property of an object. In this tutorial, you will learn about the JavaScript Object.getOwnPropertyDescriptor() method with the help of examples.
The second method is for...in loop. Try it and break after the first iteration so as to get the first key of the object:for (let prop in object) { // object[prop] break; }Example:Javascript for..in loop and break after the first iteration 1 2 3 4 5 6 7 8 let obj = { ...
constkey=Symbol('key')exportclassA{[key]=1value(){console.log(this[key])}} It seems thatkeyis not expose to outside of module, but still we are able to get it. import{A}from'./module.js'consta=newA()constkeys=Object.getOwnPropertySymbols(a)console.log(keys)//[Sybmol(key)]const...
Object.getOwnPropertyDescriptors()方法用于获取一个对象的所有自身 Property 的 Attributes。 语法 语法: Object.getOwnPropertyDescriptors(obj); 类型声明: interface ObjectConstructor { getOwnPropertyDescriptors<T>( o: T ): { [P in keyof T]: TypedPropertyDescriptor<T[P]> } & { [x: string]: Prope...