List all Object Properties This example gets all properties of an object: Example // Create an Object constperson = { firstName:"John", lastName :"Doe", language :"EN" }; // Get all Properties Object.getOwnPropertyNames(person);
Deleting Properties Thedeletekeyword deletes a property from an object: Example constperson = { firstName:"John", lastName:"Doe", age:50, eyeColor:"blue" }; deleteperson.age; Try it Yourself » or delete person["age"]; Example
Object.defineProperties: varp={}; Object.defineProperties(p, { sex: { value:'boy', writable:true, enumerable:false, configurable:false}, age2: {set: function(x) {this.age2Value =x; },get: function() {returnthis.age2Value; } } }); console.dir(p);vardesc=Object.getOwnPropertyDescri...
First, create an object whose prototype isproto. Then, if the optional parameterpropDescObjhas been specified, add properties to it – in the same manner asObject.defineProperties. Finally, return the result. For example, the following code snippet produces the same result as the previous snippet...
JavaScript has three different kinds of properties: named data properties, named accessor properties and internal properties. Named data properties (“properties”)“Normal” properties of objects map string names to values. For example, the following object obj has a data property whose name is th...
浏览器兼容性 objObject.defineProperties(obj,{property1:{value:true,writable:true,},property2:{value:"Hello",writable:false,},// 等等……}); 规范 Specification ECMAScript® 2026 Language Specification #sec-object.defineproperties
功能：分别用于定义或修改对象的多个属性和单个属性。示例：Object.defineProperties，Object.defineProperty。Object.freeze：功能：锁定对象，使其属性不可修改或删除。示例：Object.freeze。Object.getOwnPropertyDescriptor 和 Object.getOwnPropertySymbols：功能：分别获取对象属性的描述符和符号属性。示例：Object...
The Object.defineProperties() method adds or modifies properties on an object and returns the object. Example // create an object obj let obj = {}; // define multiple properties of the obj object Object.defineProperties(obj, { property1: { value: true, writable: true, }, property2: ...
Object.defineProperties()方法直接在一个对象上定义新的属性或修改现有属性,并返回该对象。 语法 Object.defineProperties(obj, props) 参数 obj 在其上定义或修改属性的对象。 props 要定义其可枚举属性或修改的属性描述符的对象。对象中存在的属性描述符主要有两种:数据描述符和访问器描述符(更多详情,请参阅Object...
接受可选参数 object。 $('#myModal').modal({ keyboard: false }) .modal('toggle') 手动打开或关闭模态框。在模态框显示或隐藏之前返回到主调函数中(也就是,在触发 shown.bs.modal 或hidden.bs.modal 事件之前)。 $('#myModal').modal('toggle') .modal('show') 手动打开模态框。在模态框显示之前...