Question

方向：编写一个名为“greetCustomers”的函数。

根据名称，“greetCustomers”会根据客户访问餐厅的次数返回问候语。请参阅customerData对象。

问候语应该有所不同，具体取决于他们预订的名称。

案例1 - 未知客户（customerData中不存在名称）：

var output = greetCustomer（'Terrance'）; 的console.log（输出）; // - ＆gt; '欢迎！这是你的第一次吗？'

案例2 - 仅访问过一次的客户（'访问'值为1）：

var output = greetCustomer（'Joe'）; 的console.log（输出）; // - ＆gt; “欢迎回来，乔！我们很高兴你第一次喜欢我们！'

案例3 - 重复客户:('访问'值大于1）：

var output = greetCustomer（'Carol'）; 的console.log（输出）; // - ＆gt; “欢迎回来，乔！很高兴再次见到你！'

注意： *您的函数不应更改customerData对象以更新访问次数。

 var customerData = {
 'Joe': {
    visits: 1
    },
'Carol': {
    visits: 2
    },
 'Howard': {
    visits: 3,
    },
'Carrie': {
    visits: 4
    }
  };

这是我的代码：

 function greetCustomer(firstName){
var greeting = ''

   for (var keys in customerData){  
       for (var k in customerData[keys])

    if (customerData[keys][k] < 0 ) greeting = 'Welcome! Is this your first time?'
    else if (customerData[keys][k] === 1) greeting = "Welcome back, " + firstName + "! We're glad you liked us the first time!"
    else if (customerData[keys][k] >= 2) greeting = "Welcome back, " + firstName + "! So glad to see you again!"
      }

   return greeting
   }
greetCustomer("Carol")

为什么不通过案例一。有没有更好的方法来访问该名称并分配或关联它的访问次数？

Answer 1

您无需遍历整个对象，只需按名字查找：

var customerData = {
  'Joe': {
    visits: 1
  },
  'Carol': {
    visits: 2
  },
  'Howard': {
    visits: 3,
  },
  'Carrie': {
    visits: 4
  }
};

function greetCustomer(firstName) {
  var greeting = '';
  if (!customerData[firstName]) {
    // if they're not found in data, it's their first time
    greeting = 'Welcome! Is this your first time?';
  } else if (customerData[firstName].visits === 1) {
    greeting = "Welcome back, " + firstName + "! We're glad you liked us the first time!";
  } else if (customerData[firstName].visits >= 2) {
    greeting = "Welcome back, " + firstName + "! So glad to see you again!";
  }
  return greeting;
}

// tests
console.log(greetCustomer("Joe"));
console.log(greetCustomer("Carol"));
console.log(greetCustomer("Howard"));
console.log(greetCustomer("Carrie"));
console.log(greetCustomer("Bob"));

Answer 2

注意：最后else if可能只是简单else声明

var customerData = {
  'Joe': {
    visits: 1
  },
  'Carol': {
    visits: 2
  },
  'Howard': {
    visits: 3
  },
  'Carrie': {
    visits: 4
  }
};



function greetCustomer(firstName) {
 var greeting = '';
 if (!customerData[firstName]){
        greeting = 'Welcome! Is this your first time?';
 }else if (customerData[firstName].visits === 1){
        greeting = "Welcome back, " + firstName + '! ' + "We're glad you liked us the first time!";
 }else{
        greeting = 'Welcome back, ' + firstName + '! ' +  'So glad to see you again!';
 }
  return greeting;
}

console.log(greetCustomer('Carrie'));
//Welcome back, Carrie! So glad to see you again!

如何将键值中的值分配给包含它的对象键？

2 个答案: