通过工厂函数、构造函数创建对象

let object1 = {
name: "jia",
add(x, y) {
return x + y;
}
}
let object2 = {
name: "wang",
add(x, y, z) {
return x + y + z;
}
}
console.log(object1.add(1, 2))
console.log(object2.add(1, 2, 3))

function factory(name = '') {
return {
name,
add(...args) {
return args.reduce((sum, item) => sum + item, 0)
}
}
}
console.log(factory('jia').add(1, 2))
console.log(factory('wang').add(1, 2, 3))

function User(name) {
this.name = name
this.show = function () {
console.log(`my name is ${name}`)
}
// 函数被实例化时
// 如果没有定义 return 时,默认值为 this
// return this
// 当然,如果不想返回 this 可以自定义返回值
// return {}
}
const person = new User('liang')
person.show()

const obj = new Object()
const obj = new Object({ name: "liang" })
const count = new Number(100)
const string = new String('liang')
const bool = new Boolean(true)
const date = new Date()
const regexp = new RegExp(/\d{3,}/)
const fun = new Function('cms', `console.log('this is function')`)