javascript计算器5 + 5 = 55？

Question

嘿,我做了一个javascript计算器,想要尝试5 + 5它给我55除了10？然而,如果我尝试5/5它给我1罚款,如果我尝试5 - 5它给我0罚款和相同的时间我不能忍受我的代码的问题也想尝试console.log它不工作,所以我使用document.write

这是我的代码

var Plus = function()
{
    var N1 = prompt("Enter first number");
    var N2 = prompt("Enter second number");
    var sum = (N1 + N2);
    document.write(sum);
} 

var Minus = function()
{
    var N1 = prompt("Enter first number");
    var N2 = prompt("Enter second number");
    var sum = (N1 - N2);
    document.write(sum);
}

var Division = function()
{
    var N1 = prompt("Enter first number");
    var N2 = prompt("Enter second number");
    var sum = (N1 / N2);
    document.write(sum);
}

var Times = function()
{
    var N1 = prompt("Enter first number");
    var N2 = prompt("Enter second number");
    var sum = (N1 * N2);
    document.write(sum);
}

var Answer = prompt("Plus ?, Minus ?, Division ? or Times ?");

    if( Answer === "Plus")
    {
        Plus();
    }
    else
    {
        if( Answer === "Minus")
        {
            Minus();
        }
        else
        {
            if( Answer === "Division")
            {
                Division();
            }
            else
            {
                if( Answer === "Times")
                {
                    Times();
                }
                else
                {
                    document.write("How did you get here?");
                }
            }
        }
    }

Answer 1

N1并且N2是字符串,而不是数字.添加两个字符串将它们连接起来,这就是你的"错误".

您需要将它们解析为数字:

var N1 = Number(prompt("Enter first number"));