使用提示符，选择数字数量，将该数字数量添加到数组中，然后显示总计

Question

我正在尝试加载一个提示，询问用户要输入多少个数字，然后提示将弹出他们输入的次数，并且每次输入一个数组时，他们将能够输入一个数字，然后输入一个最后一个警报框显示总和。

我如何建立这个数组，然后得到总和？

为了获得第一个numberOfNumbers，我使用了以下方法：

 function hello() { var numberOfNumbers=prompt("How many numbers would you like to add?") alert(y) } var sum = []; for (var i = 1; i <= numberOfNumbers; i++) { sum.push(i); } 

Answer 1

为什么要构建阵列？

 var numberOfNumbers = parseInt(prompt("How many numbers would you like to add?")); if(isNaN(numberOfNumbers) || numberOfNumbers <= 0) { alert("Invalid number!"); } else { var sum = 0, i; for (i = 1; i <= numberOfNumbers; i++) { sum += i; } alert(sum); } 

另外，正如@JohnRummuel所指出的，在您的代码中numberOfNumbers并不存在于功能块的范围之外，因此for循环不会“看到”它。

Answer 2

var numberOfNumbers = parseInt(prompt("How many numbers would you like to add?"));
alert(numberOfNumbers);

var sum = 0;
for (var i = 1; i <= numberOfNumbers; i++) {
   sum += parseInt(prompt("Enter a number"));
}
alert("The sum of numbers you entered is " + sum);

Answer 3

这是你想做的吗？

function hello() { 
    var numberOfNumbers = prompt("How many numbers would you like to add?"); 
    return parseint(numberOfNumbers, 10);
}

function sumNumbers() {
    var numbers = []; 
    var number = 0; 
    var numberOfNumbers = hello(); 
    for (var i = 1; i <= numberOfNumbers; i++) { 
        number = parseInt(prompt("Enter a number to add"), 10); 
        numbers.push(number); 
    } 
    alert(numbers.reduce(function(a, b) { return a + b; })) ; 
}