Object.defineProperties(object, descriptors) // Accessing a Property Object.getOwnPropertyDescriptor(object, property) // Accessing Properties Object.getOwnPropertyDescriptors(object) // Returns all properties as an array Object.getOwnPropertyNames(object) ...
Object.assign() Object.create() Object.defineProperty() 属性描述符 描述符默认值汇总 描述符可拥有的键值 创建属性 修改属性 Writable 属性 Enumerable 属性 Configurable 属性 添加多个属性和默认值 自定义 Setters 和 Getters 继承属性 Object.defineProperties() Object.entries() Object.freeze() Object.getOwnPr...
Object.defineProperty(o, "a", { get : function(){return 1;}, configurable : false } ); // throws a TypeError Object.defineProperty(o, "a", {configurable : true}); // throws a TypeError Object.defineProperty(o, "a", {enumerable : true}); // throws a TypeError (set was undefined ...
Object.defineProperties The Object.defineProperties() method defines new or modifies existing properties directly on an object, returning the object. 和Object.defineProperty类似,只不过这个方法可以设置多个属性。 语法 Object.defineProperties(obj, props) 参数 Object obj目标对象 Object props要为目标对象添加的...
varo = {};// 创建一个新对象// Example of an object property added with defineProperty with a data property descriptorObject.defineProperty(o,"a", {value :37, writable :true, enumerable :true, configurable :true});// 对象o拥有了属性a,值为37// Example of an object property added with de...
let obj=Object.create(person,{ z: { value:8} }) console.log(obj)//{z:8}console.log(Object.getPrototypeOf(obj))//{name: "zengfp", age: 25} 3、Object.defineProperties 函数 (JavaScript)。将一个或多个属性添加到对象,并/或修改现有属性的特性。语法:object.defineProperties(object, descriptors...
Object.defineProperties(obj, { 'property1': { value: true, writable: true }, 'property2': { value: 'Hello', writable: false } // etc. etc. }); console.log(obj) // {property1: true, property2: "Hello"} Object.defineProperty(obj,prop,descriptor) ...
Object 是 JavaScript 的一种数据类型。它用于存储各种键值集合和更复杂的实体。可以通过 Object() 构造函数或者使用对象字面量的方式创建对象。
The JavaScript exception "can't define property "x": "obj" is not extensible" occurs whenObject.preventExtensions()marked an object as no longer extensible, so that it will never have properties beyond the ones it had at the time it was marked as non-extensible. ...
Example 1: JavaScript Object.defineProperty() // create an object named userletuser = {}; // define the name property of the user objectObject.defineProperty(user,"name", {value:"John",writable:false}); // attempt to change the name property// change will fail silentlyuser.name ="John ...