var meals = {
breakfast: "oatmeal",
lunch: "turkey sandwich",
dinner: "steak and potatoes"
};
=> 未定义
Object.assign({}, meals, {breakfast: ['oatmeal', 'banana']})
=> {早餐:数组(2),午餐:“火鸡三明治”,晚餐:“牛排和土豆”}
为什么 chrome 控制台显示Array(2)
而不是显示数组的实际值,即['oatmeal', 'banana']
.