JavaScript计算器5 + 5 = 55？

问题描述

嘿，我做了一个JavaScript计算器，想尝试5 + 5，它给了我55，然后是10？如果我尝试5/5怎么会给我1罚款如果我尝试5-5会给我0罚款，而且与我不理解的时间相同我的代码问题也想尝试console.log它不会工作，所以我使用document.write

Hey I made a javascript calculator and want the to try 5 + 5 it give me 55 other then 10 ? How ever if I try 5 / 5 it give me 1 fine if i try 5 - 5 it gives me 0 fine and same with times i don't under stand the problem with my code also want to try console.log it doesn't work so I use 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?");
                }
            }
        }
    }

推荐答案

N1 和 N2 是字符串，而不是数字。将两个字符串加在一起将它们串联在一起，这就是您的错误。

N1 and N2 are strings, not numbers. Adding two strings together concatenates them, which is what your "error" is.

您需要将它们解析为数字：

You need to parse them into numbers:

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

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