hologram prototype

For the rewrite of prototype prototype objects, we can use the following two ways: Add the attributes you want to add to the prototype object using the most primitive syntax function= "Tom"="Doctor"; Person.prototype.sayname=function() { alert (this. name);} var New Person (); Person1.sayname (); // Tom2. Use a simple

In-depth analysis on prototype of ctipt PT: Is prototype attributes a copy, a reference, or a fixed search method? ---- 03 _ add the Same Name attribute of prototype to the instance // // Output: After the instance is created, person. Username: zhangsanAfter adding an attribute with the same name as prototype to

() {} // function Expression var function // trueconsole.log (man.__proto__ = = = Function.prototype) // TrueWhat does that mean?All constructors come from Function.prototype, even the root constructor object and the function itself. All constructors inherit the properties and methods of the Function.prototype. such as length, call, apply, bind (ES5).Function.prototype is also the only prototype that typeof Xxx.prototype as "function". The

Each function created in JavaScript has a prototype (prototype) attribute, which is a pointer to an object that is used to contain properties and methods that can be shared by all instances of a particular type. If it is understood literally, then prototype is the prototype object that creates that instance by invoking

Before we discuss prototypes, we need to know what prototypes are, and keep these rules in mind .　　A prototype is a default property (prototype) of all function (constructor) objects, and its value is an object {what is inside}; So we generally say that the prototype is the property of the constructor, and it is also an object;What the

Each function we create has a prototype (prototype) attribute, which is a pointer to an object, and the purpose of this object is to include properties and methods that can be shared by all instances of a particular type. If it is understood literally, then prototype is the prototype object of the object instance creat

//1.几乎所有函数都有prototype属性,这个是个指针,指向原型对象;Function.prototype这个没有 //2.所有对象中都有__proto__属性.(Object.prototype该属性的值为null) //几乎所有函数都有 prototype/__proto__属性 //3.函数都是Function的实例(函数是通过Function创建出来的对象) //自定义函数,Function,Array,RegExp,String,Boolean,Number,Object都是函数,都是通过Function创建出来的 //4.几乎所有函数都继承自:Function.prototype //函数.__proto__===Function.prototype(除了Function.prototype本身,他没有

ExtJs -- 09 -- three methods of javascript Object writing prototype: the most efficient way to set prototype through prototype /*** Recommended three methods for writing javascript objects. The third method is recommended for execution efficiency. */function P (name, age) {this. name = name; this. age = age; // method 1 this. show = function () {alert (this. nam

First, overview:Use the prototype instance to specify the kind of objects that are created, and create new objects by copying those prototypes. Simply put, a copy of the object creates a new object (the clone of the object), and the prototype pattern is an object-creation pattern .Second, the use of the scene:Creating a new object can be obtained by copying an existing object and, if it is a similar object,

Details about prototype and prototype chain in JavaScript -- Item15 Those who have used JavaScript must be familiar with prototype. However, this makes it difficult for beginners to understand that a function has a prototype attribute, you can add functions for it for instance access. The rest is unclear. Recently, I r

Copy Code code as follows: var people={name: "Xiong", age:15}; var person=function (user,age) { This.name=user; This.age=age; This.say=function () {alert ("I am" +this.name+ "\ n" +this.age);} //} var chairman=function (name,salary) { Person.call (This,name); //} var bill=new person ("Bill", 15); var hu=new chairman ("Hu Jintao"); Person.prototype.eat=function () { Alert ("I ' m eating"); //} Bill.eat (); function person (name)//base class constructor { THIS.name = name; }

Each function created in JavaScript has a prototype (prototype) attribute, which is a pointer to an object that is used to contain properties and methods that can be shared by all instances of a particular type. If the literal meaning is understood, then prototype is the prototype object of the object instance created

In JavaScript, inheritance is a wonderful way to implement interface inheritance, and can only rely on prototype inheritance. Prototype chaina prototype is an object, and an instance created through a constructor has a pointer to the prototype's properties and methods. In this way, the instance object takes the property method of the constructor and the property

//https://xxxgitone.github.io/2017/06/10/JavaScript%E5%88%9B%E5%BB%BA%E5%AF%B9%E8%B1%A1%E7%9A%84%E4%B8%83%E7 %a7%8d%e6%96%b9%e5%bc%8f/Source functionPerson () {} Person.prototype.name= ' Jiang ';//adding properties and methods to an object varPerson1 =NewPerson (); varPerson2 =NewPerson (); Console.log (Person1.name)//JiangConsole.log (Person2.name)//Jiang //Console.log (object.getprototypeof (Person1));//Output specified object prototyp