解构赋值 - 数值和布尔值的解构赋值

       let {toString: s} = 123;
       console.log(s) // ƒ toString() { [native code] }

       let {toString: s} = false;
       console.log(s) // ƒ toString() { [native code] }

        let { prop: x } = undefined; 
        let { prop: y } = null; 
        console.log(x) // TypeError
        console.log(y) // TypeError