JavaScript object add, delete, modify the properties of the object

https://www.cnblogs.com/goweb/p/5357640.html

 

Take advantage of dynamic properties

function Person(){};
            var person = new Person ();
            person.name = 'yy';
            person.gender = 'girl';
            console.log(person.name+','+person.gender);//yy,girl
            delete person.name;//Delete property
            console.log(person.name);//undefined
// variant
            function Person(){};
            var person = new Person ();
            person['name'] = 'yy';
            person['gender'] = 'girl';
            console.log(person.name+','+person.gender);//yy,girl
            delete person.name;//Delete property
            console.log(person.name);//undefined

　

this in the constructor

var Person = function () {
                this.name = 'yy';
                this.gender = 'girl'
            };
            var person = new Person ();
            console.log(person.name+','+person.gender);//yy,girl

　

Add properties to prototype

var Person = function () {    
            };
            Person.prototype.name = 'yy';
            Person.prototype.gender = 'girl';
            var person = new Person ();
            console.log(person.name+','+person.gender);//yy,girl
            console.log(person['name']+','+person['gender']);//yy,girl

　　

Literally add properties

var person = {    
            };
            person.name = 'yy';
            person.gender = 'girl';
            console.log(person.name+','+person.gender);//yy,girl
            console.log(person['name']+','+person['gender']);//yy,girl
// another way of writing
            var person = {
                name: 'yy',
                gender: 'girl'
            };
            console.log(person.name+','+person.gender);//yy,girl
            console.log(person['name']+','+person['gender']);//yy,girl

　　

Encapsulate the extend method

var p1 = {};
            var p2 = {name:'yy',gender:'girl'};
            p1.extend = function(obj){
                for(var k in obj){
                    this[k] = obj[k];
                }
            }
            p1.extend(p2);
            console.log(p1.name+','+p1.gender);//yy,girl
            console.log(p1['name']+','+p1['gender']);//yy,girl