無法弄清楚我的程序有什么問題

Question

嘿伙計們，當我運行這個程序時，它不會添加我的數字，基本上我應該打印銷售最暢銷的銷售員，以及最暢銷的汽車。 例如，當我在最后為每輛車輸入50金額時，它會打印：050505050而不是總計為200 ...

function salesPerson(name, id, amount) {
            this.name = name;
            this.id = id;
            this.amount = amount;
        };


    //Create car array for each brand
        var Car = new Array(4);

        //Create array of salePersons
        var Person = new Array(2);

        //Every element in the array is a object type salesPerson
        for (var i = 0; i < Person.length; i++) {
            Person[i] = new salesPerson("", 0, 0);
        }

        var temp = 0;

        var m = 0;
        var a = 0;
        var p = 0;
        var b = 0;



        for(var i = 0; i < Person.length; i++){
           Person[i].name = prompt("Enter salesman name: ");
           Person[i].id = prompt("Enter salesman id: ");

           temp = prompt("Enter Mercedes-Benz amount: ");
           Person[i].amount += temp;
           m += temp;

           temp = prompt("Enter Audi amount: ");
           Person[i].amount += temp;
           a += temp;

           temp = prompt("Enter Porsche amount: ");
           Person[i].amount += temp;
           p += temp;

           temp = prompt("Enter BMW amount: ");
           Person[i].amount += temp;
           b += temp;

        }

        var max = 0;
        var name = "";

        for (var i = 0; i < Person.length; i++) {
            if (Person[i].amount > max) {
                max = Person[i].amount;
                name = Person[i].name;
            }
        }

        alert("The best salesperson of the month is " + name + ", with the sales amount of $" + max);

Answer 1

提示的結果是一個字符串，所以+是連接的。 一個非常粗略的解決方法是做一些像：

temp = +prompt("Enter Mercedes-Benz amount: ");

其中+導致轉換。 請注意，這非常粗糙 - 它不會進行任何檢查或錯誤處理。

Answer 2

你需要將temp轉換為number ; 使用一元運算符+或parseInt() 。

 for(var i = 0; i < Person.length; i++){
           Person[i].name = prompt("Enter salesman name: ");
           Person[i].id = prompt("Enter salesman id: ");

           temp = +prompt("Enter Mercedes-Benz amount: ");
           Person[i].amount += temp;
           m += temp;

           temp = +prompt("Enter Audi amount: ");
           Person[i].amount += temp;
           a += temp;

           temp = +prompt("Enter Porsche amount: ");
           Person[i].amount += temp;
           p += temp;

           temp = +prompt("Enter BMW amount: ");
           Person[i].amount += temp;
           b += temp;

        }

工作小提琴

Answer 3

在將解析字符串添加為Integer之前。

 function salesPerson(name, id, amount) { this.name = name; this.id = id; this.amount = amount; }; //Create car array for each brand var Car = new Array(4); //Create array of salePersons var Person = new Array(2); //Every element in the array is a object type salesPerson for (var i = 0; i < Person.length; i++) { Person[i] = new salesPerson("", 0, 0); } var temp = 0; var m = 0; var a = 0; var p = 0; var b = 0; for(var i = 0; i < Person.length; i++){ Person[i].name = prompt("Enter salesman name: "); Person[i].id = prompt("Enter salesman id: "); temp = parseInt(prompt("Enter Mercedes-Benz amount: ")); Person[i].amount += temp; m += temp; temp = parseInt(prompt("Enter Audi amount: ")); Person[i].amount += temp; a += temp; temp = parseInt(prompt("Enter Porsche amount: ")); Person[i].amount += temp; p += temp; temp = parseInt(prompt("Enter BMW amount: ")); Person[i].amount += temp; b += temp; } var max = 0; var name = ""; for (var i = 0; i < Person.length; i++) { if (Person[i].amount > max) { max = Person[i].amount; name = Person[i].name; } } alert("The best salesperson of the month is " + name + ", with the sales amount of $" + max); 

Answer 4

當您從用戶那里獲取輸入時，它將作為字符串接收。 您需要將此輸入轉換為int。 這可以通過使用parseInt(value, radix)來完成。 要了解有關parseInt函數的更多信息，請參閱http://www.w3schools.com/jsref/jsref_parseInt.asp