首先看一下我们之前的一个餐厅的对象

const restaurant = {
  name: 'Classico Italiano',
  location: 'Via Angelo Tavanti 23, Firenze, Italy',
  categories: ['Italian', 'Pizzeria', 'Vegetarian', 'Organic'],
  starterMenu: ['Focaccia', 'Bruschetta', 'Garlic Bread', 'Caprese Salad'],
  mainMenu: ['Pizza', 'Pasta', 'Risotto'],
  openingHours: {
    thu: {
      open: 12,
      close: 22,
    },
    fir: {
      open: 11,
      close: 23,
    },
    sat: {
      open: 0,
      close: 24,
    },
  },

  order: function (starterIndex, mainIndex) {
    return [
      restaurant.starterMenu[starterIndex],
      restaurant.mainMenu[mainIndex],
    ];
  },

  oderDelivery: function({starterIndex = 1, mainIndex = 0, time='20:00',address,}) {
    console.log(`Order received! ${this.starterMenu[starterIndex]} and ${this.mainMenu[mainIndex]} will be delivered to ${address} at ${time}`);
  },

  orderPasta: function(ing1,ing2,ing3) {
    console.log(`Here is your declicious pasta with ${ing1},${ing2},${ing3}`);
  },

  orderPizza: function(mainIngredient, ...ohterIngredients) {
    console.log(mainIngredient);
    console.log(ohterIngredients);

  }

};

这个里面包含了一个包含时间的对象，我们现在将它提取出来

const openingHours =  {
  thu: {
    open: 12,
    close: 22,
  },
  fir: {
    open: 11,
    close: 23,
  },
  sat: {
    open: 0,
    close: 24,
  },
};
const restaurant = {
  name: 'Classico Italiano',
  location: 'Via Angelo Tavanti 23, Firenze, Italy',
  categories: ['Italian', 'Pizzeria', 'Vegetarian', 'Organic'],
  starterMenu: ['Focaccia', 'Bruschetta', 'Garlic Bread', 'Caprese Salad'],
  mainMenu: ['Pizza', 'Pasta', 'Risotto'],
  order: function (starterIndex, mainIndex) {
    return [
      restaurant.starterMenu[starterIndex],
      restaurant.mainMenu[mainIndex],
    ];
  },

  oderDelivery: function({starterIndex = 1, mainIndex = 0, time='20:00',address,}) {
    console.log(`Order received! ${this.starterMenu[starterIndex]} and ${this.mainMenu[mainIndex]} will be delivered to ${address} at ${time}`);
  },

  orderPasta: function(ing1,ing2,ing3) {
    console.log(`Here is your declicious pasta with ${ing1},${ing2},${ing3}`);
  },

  orderPizza: function(mainIngredient, ...ohterIngredients) {
    console.log(mainIngredient);
    console.log(ohterIngredients);

  }

};

现在如果我们还想餐厅中包含时间这个对象，我们需要这么写

 openingHours: openingHours,

● 但是在ES6中，出现了增强的对象文字，我们只需要如下写就可以了

openingHours,

● 初次之前，在对象中写函数也可以更加的方便如下

oderDelivery: function({starterIndex = 1, mainIndex = 0, time='20:00',address,}) {
    console.log(`Order received! ${this.starterMenu[starterIndex]} and ${this.mainMenu[mainIndex]} will be delivered to ${address} at ${time}`);
  },

  orderPasta: function(ing1,ing2,ing3) {
    console.log(`Here is your declicious pasta with ${ing1},${ing2},${ing3}`);
  },

  orderPizza: function(mainIngredient, ...ohterIngredients) {
    console.log(mainIngredient);
    console.log(ohterIngredients);


//ES6的对象文字写法
  oderDelivery({starterIndex = 1, mainIndex = 0, time='20:00',address,}) {
    console.log(`Order received! ${this.starterMenu[starterIndex]} and ${this.mainMenu[mainIndex]} will be delivered to ${address} at ${time}`);
  },

  orderPasta(ing1,ing2,ing3) {
    console.log(`Here is your declicious pasta with ${ing1},${ing2},${ing3}`);
  },

  orderPizza(mainIngredient, ...ohterIngredients) {
    console.log(mainIngredient);
    console.log(ohterIngredients);

  }

● 再看看对象文字的其他特性

//原代码
const openingHours =  {
  thu: {
    open: 12,
    close: 22,
  },
  fir: {
    open: 11,
    close: 23,
  },
  sat: {
    open: 0,
    close: 24,
  },
};

//对象文字的写法
const weekdays = ['mon','the','wed','thu','fri','sat','sun'];
const openingHours =  {
  [weekdays[3]]: {
    open: 12,
    close: 22,
  },
  [weekdays[4]]: {
    open: 11,
    close: 23,
  },
  [weekdays[5]]: {
    open: 0,
    close: 24,
  },
};