this.lastNamemeans thelastNameproperty ofperson. Accessing Object Methods You access an object method with the following syntax: objectName.methodName() If you invoke thefullName propertywith (), it will execute as afunction: Example name = person.fullName(); ...
if(!Object.create) {Object.create=function(o) {if(arguments.length>1) {thrownewError('Object.create implementation'+' only accepts the first parameter.'); }functionF() {} F.prototype= o;returnnewF(); }; } Object.create可用于创建一个对象,它的函数原型中接受两个参数,第一个参数是原型对象...
console.log(typeofarr);//objectconsole.log(arr.xingming);//小明 说明数组有对象的一切特征,能添加属性,但是你不能说这个数组只有name、age、sex三个属性,别的什么都没有,毕竟它有一组数。 函数也是对象: typeof检测类型返回结果是function不是object,这是系统规定,但function也是object对象,后面详解。 function...
object.prop:'default';prop;// => 'default' 当要检查的属性数量增加时,三元运算符语法的使用会变得艰巨。对于每个属性,你必须创建一个新的代码行来处理默认值,增加类似外观的三元运算符的丑陋墙。 为了使用更优雅的方法,让我们熟悉称为object destructuring的一个伟大的ES2015功能。[对象解构](https://developer...
Universal time(UTC) is documented at the bottom of this page. Note 2 The get methods return information from existing date objects. In a date object, the time is static. The "clock" is not "running". The time in a date object is NOT the same as current time. ...
在Design Patterns: Elements of Reusable Object Oriented Software这本书中有两个关于面向对象设计程序的原则: Program to an interface, not an implementation面向接口编程 Favor object composition over class inheritance优先使用组合,而非继承 在某种意义上,上边的第二个原则同样遵循了第一个原则,因为继承把父类暴...
The Object.getOwnPropertyDescriptors() method returns the property descriptors for all the properties of the given object. Example let obj = { value: 11, get number() { return this.value; }, }; // get property descriptors for all the properties of obj let objectProperties = Object.get...
deepFreeze(game);game.developer.name ='Activision Blizzard';//Cannot assign toreadonly property'name'of object 将对象转换为地图 我们可以使用 Object.entries 和 Map 构造函数将对象转换为地图。这是一个例子。 constgame = {name:'Warcraft',developer:...
Compared with Array, javascript missing the Object utils, think Array.prototype.filter, Array.prototype.map conterpart of ObjectUnlike lodash, objutil only provide methods for Object, like Object.pick, Object.defaults, Object.get etc, small and customizable...
The Object.prototype object is the base object for all JavaScript objects. The Object object inherits all of its properties and methods from the Function.prototype and Object.prototype objects, except the prototype property that refers to the Object.prototype object. Objects that can be instantiated...