This article brings you code examples about classes and objects in ES6. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
1.Basic definition and generated instance
{ class Parent { constructor(name = 'haha') { this.name = name; } } let parent = new Parent('v'); console.log('构造函数和实例', parent); // Parent {name: "v"} }
2.Inheritance
{ class Parent { constructor(name = 'haha') { this.name = name; } } class Child extends Parent { } console.log('继承', new Child()); // Child {name: "haha"} }
3.Inheritance passing parameters
{ class Parent { constructor(name = 'haha') { this.name = name; } } class Child extends Parent { constructor(name = 'child') { // super()方法,用来解决 继承怎么传递参数(怎么覆盖父类的参数) // super的参数列表就是父类构造函数的参数列表,如果参数为空,就采用父类的参数默认值 super(name); // super必须放在构造函数第一行 this.type = 'child'; } } console.log('继承传递参数', new Child('hello')); // Child {name: "hello", type: "child"} }
4.getter setter
{ class Parent { constructor(name = 'haha') { this.name = name; } // longName 是一个属性,不是方法 get longName() { return 'lu-' + this.name; } // longName 是一个属性,不是方法 set longName(value) { this.name = value; } } let person = new Parent(); console.log('getter', person.longName); // lu-haha person.longName = 'hello'; console.log('setter', person.longName); // lu-hello }
5.static method
{ class Parent { constructor(name = 'haha') { this.name = name; } // static 关键字用来定义静态方法 static tell() { console.log('do tell'); } } // 静态方法,直接通过类去调用,不是通过实例 Parent.tell(); // do tell }
6.static Attribute
{ class Parent { constructor(name = 'haha') { this.name = name; } } // 直接在类上定义静态属性 Parent.type = 'test'; // 读取静态属性时,也是直接拿类读取 console.log(Parent.type); // test }
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