};//instantiate object using the constructor functionvarcar =Object.create(Car.prototype); car.color= "blue"; alert(car.getInfo()); 结果为:A blue undefined. 1、propertiesObject 参数的详细解释:(默认都为false) 数据属性: writable:是否可任意写 configurable:是否能够删除,是否能够被修改 enumerable:是...
Here, thenewkeywordis used with theObject()instance to create an object. Example 3: Create an object using Constructor Function // program to create JavaScript object using instance of an objectfunctionPerson(){this.name ='John',this.age =20,this.hobbies = ['reading','games','coding'],th...
The example creates an object with Object constructor. Function constructor A function constructor is created with afunctionkeyword. It takes the values as parameters. The attributes are set usingthiskeyword. Methods are created withthisandfunctionkeywords. New objects are created withnewkeyword. functio...
functionConstructor(){}o=newConstructor();// 等价于:o=Object.create(Constructor.prototype); 当然,如果Constructor函数中有实际的初始化代码,那么Object.create()方法就无法反映它。 Specification ECMAScript® 2026 Language Specification #sec-object.create...
//instantiate object using the constructor function var car = Object.create(Car.prototype); car.color = "blue"; alert(car.getInfo()); //displays 'A blue undefined.' ??! The description is lost. So why is that? Simple; the create() method only uses the prototype and not the construct...
function Constructor(){} o = new Constructor(); // is equivalent to: o = Object.create(Constructor.prototype); // Of course, if there is actual initialization code in the Constructor function, the Object.create cannot reflect it // create a new object whose prototype is a new, empty obj...
Originally published in the A Drip of JavaScript newsletter. A few issues back we looked at how to implement basic inheritance with constructors. In this issue, we'll look at how to do the same with the newer Object.create.When using constructors for inheritance, we attach properties to ...
Object.create()is a javascript method (function on an object) that creates a new object while using a former object as the new object's prototype. What are prototypes? Prototypes are also objects. For an object (A) to be a protoype of object (B), it means that B has access to some...
constructor (context, { pkg = {}, plugins = [], completeCbs = [], files = {}, invoking = false } = {}) { this.context = context this.plugins = plugins this.originalPkg = pkg this.pkg = Object.assign({}, pkg) this.imports = {} ...
function Car (desc) { this.desc = desc; this.color = "red"; } Car.prototype = { getInfo: function() { return 'A ' + this.color + ' ' + this.desc + '.'; } }; //instantiate object using the constructor function var car = Object.create(Car.prototype); car.color = "blue";...