添加 for 循环内的多个警报的结果

Question

我使用此代码的目标是创建一个临时购物车，让您可以选择从一小部分商品中进行选择、选择数量、获取总数、删除商品（如果需要）并继续“结帐”。我的问题是，一旦我通过项目类型（通过警报）获得价格结果，我不知道如何将所有潜在警报添加在一起，因为它在 for 循环中运行。有谁知道如何做到这一点？我对JS相当陌生，不知道如何进行。这也是我在堆栈上的第一个问题，如果这是一个奇怪的问题，请原谅我。

这是我的代码：

var item = function(itemName, itemPrice, itemTax) {
  this.products = itemName;
  this.cost = itemPrice;
  this.taxes = itemTax;
  this.total = itemPrice + (itemPrice * itemTax)
}

var list = [];

list[0] = new item("Shoes", 67.99, .075);
list[1] = new item("Coat", 78.99, .075);
list[2] = new item("Book", 9.99, .075);
list[3] = new item("Suitcase", 56.99, .075);

function theStore() {
  var greeting = prompt("Welcome to xxxxxxxx! Do you want to begin shopping?");



  while (greeting === "Yes")
  {

      for (var i = 0; i < list.length; i++) 
      {
        var j = list[i];
        var adding = prompt("The " + j.products + " cost " + j.cost + ". Would you like to add it to your cart?")
        if (adding === "Yes")
        {
          var addingMore = prompt("How much do you want?")
          if (addingMore < 1)
          {
            alert("This item was not added to your cart.") 
          }

          else
          {
            alert(addingMore + " of " + j.products +" has been added to your cart." + " Your total for this kind of item is " + addingMore * (j.cost) + ".")
          }

      }
      else
      {
        alert(j.products + " was not added to your cart.")
      }
    }

    greeting = prompt("Do you want to continue shopping? Yes or No");


  }
}

theStore()

理想情况下，当用户提示“否”（第 47 行）时，我想向他们显示所有项目的总数。

感谢任何帮助/提示/建议。

Answer 1

在循环外声明一个变量totalAmount，并在用户将东西添加到购物车时添加到它。然后当用户没有点击警报时，总金额。

我添加了一个小计变量，该变量由用户选择项目数量时计算得出。小计是添加到最后提醒的变量 totalAmount 中。

var item = function(itemName, itemPrice, itemTax) {
  this.products = itemName;
  this.cost = itemPrice;
  this.taxes = itemTax;
  this.total = itemPrice + (itemPrice * itemTax)
}

var list = [];
var totalAmount = 0;

list[0] = new item("Shoes", 67.99, .075);
list[1] = new item("Coat", 78.99, .075);
list[2] = new item("Book", 9.99, .075);
list[3] = new item("Suitcase", 56.99, .075);

function theStore() {
  var greeting = prompt("Welcome to xxxxxxxx! Do you want to begin shopping?");



  while (greeting === "Yes")
  {

      for (var i = 0; i < list.length; i++) 
      {
        var j = list[i];
        var adding = prompt("The " + j.products + " cost " + j.cost + ". Would you like to add it to your cart?")
        if (adding === "Yes")
        {
          var addingMore = prompt("How much do you want?")
          if (addingMore < 1)
          {
            alert("This item was not added to your cart.") 
          }

          else
          {
            var subTotal = addingMore * (j.cost);
            totalAmount += subTotal;
            alert(addingMore + " of " + j.products +" has been added to your cart." + " Your total for this kind of item is " + subTotal.toString() + ".")
          }

      }
      else
      {
        alert(j.products + " was not added to your cart.")
      }
    }

    greeting = prompt("Do you want to continue shopping? Yes or No");

    if(greeting === "No"){
        alert("Your Total Amount is: " + totalAmount);
    }

  }
}

theStore()

Answer 2

  var item = function(itemName, itemPrice, itemTax) {
  this.products = itemName;
  this.cost = itemPrice;
  this.taxes = itemTax;
  this.total = itemPrice + (itemPrice * itemTax)
}

var list = [];

list[0] = new item("Shoes", 67.99, .075);
list[1] = new item("Coat", 78.99, .075);
list[2] = new item("Book", 9.99, .075);
list[3] = new item("Suitcase", 56.99, .075);

    var selected_items = [];

    function theStore() {
      var greeting = confirm("Welcome to xxxxxxxx! Do you want to begin shopping?");



      while (greeting)
      {

          for (var i = 0; i < list.length; i++) 
          {
            var j = list[i];
            var adding = confirm("The " + j.products + " cost " + j.cost + ". Would you like to add it to your cart?")
            if (adding)
            {
              var addingMore = prompt("How much do you want?")
              if (addingMore < 1)
              {
                alert("This item was not added to your cart.") 
              }

              else
              {
                alert(addingMore + " of " + j.products +" has been added to your cart." + " Your total for this kind of item is " + addingMore * (j.cost) + ".");
    j.quantity = addingMore;              // Add user selected quantity to object

    j.total_cost = addingMore * (j.cost); // Add cost if user selected quantity to object

    selected_items.push(j);               // Let's store it in array.
              }

          }
          else
          {
            alert(j.products + " was not added to your cart.")
          }
        }

        greeting = confirm("Do you want to continue shopping? Yes or No");

      return selected_items;
      }
    }

    // theStore() Stored array can be utilised for processing.
    console.log(theStore());