灵活的js代码

let stateObj = {a:1,b:3}; ??????????????????let newObj = {b:13,c:4} ; ??????????????????stateObj = {...stateObj, ...newObj} ;console.log(stateObj); 
// 输出 {a: 1, b: 13, c: 4}

let {a = 0} = {a:1,b:3} ;a = a + 1 ;console.log(a) ; ??
// 输出2

//ES6 允许直接写入变量和函数，作为对象的属性和方法。这样的书写更加简洁。
const foo = ‘bar‘;const baz = {foo};console.log(baz); ?

//输出{foo: "bar"}