es6 类实例属性的两种写法

es6 类实例属性的两种写法

带参数

• 可以传参，但是要多写一个constructor

class Person {
	constructor(name, age) {
		this.name = name
		this.age = age
	}
	speak() {
		console.log(`my name is ${this.name}, I am ${this.age} years old`)
	}
}

不带参数

• 新写法， 直观，简洁，适合不需要传参的类

class Person {
	name = 'zyx'
	age = 27
	speak() {
		console.log(`my name is ${this.name}, I am ${this.age} years old`)
	}
}

调用

const person1 = new Person()
const person2 = new Person('zyx', 27)
person1.speak()
person2.speak()