修改原型链

将 b 设置成 a 得原型链

 let a = {name:"张三"}

        let b = {name:"王二麻子"}

        console.log(a)

        console.log(b)

        console.log(b.__proto__==a.__proto__)

        Object.setPrototypeOf(a,b)

        let newA = Object.getPrototypeOf(a)

        console.log(newA)