手写new

       function myNew(fn, ...args) {
            console.log(args)
            console.log(arguments)
            console.log(fn)
            // var obj = Object.create(fn.prototype)
            let obj = {}
            obj.__proto__ == fn.prototype
            fn.apply(obj, args)
            return obj
        }
        function Cons(name, age) {
            console.log(this)
            this.name = name
            this.age = age
            console.log(this)
        }
        let cons1 = myNew(Cons, "me", 26)
        console.log(cons1)