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我一直对计算机编程充满兴趣
2023-06-13 09:04:46 深夜i     --     --
JavaScript 简易计算器 代码例子

我一直对计算机编程充满兴趣,今天我想与大家分享一个JavaScript简易计算器的代码例子。在学习JavaScript的过程中,了解如何编写一个计算器是很重要的一步。下面我将向大家介绍,如何使用HTML、CSS和JavaScript编写一个简单的计算器。

首先我们需要使用HTML创建计算器的基本页面,并且为每个数字和操作符按钮分配一个ID。下面是一个基本的HTML代码实例:


JavaScript 简易计算器

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在CSS中,我们可以设置按钮的样式和计算器的显示样式。

接下来,我们需要使用JavaScript为计算器添加逻辑。下面是一个简单的代码实例,可以实现加、减、乘、除和清除操作。


window.onload = function() {

var result = document.getElementById("result");

var one = document.getElementById("one");

var two = document.getElementById("two");

var three = document.getElementById("three");

var four = document.getElementById("four");

var five = document.getElementById("five");

var six = document.getElementById("six");

var seven = document.getElementById("seven");

var eight = document.getElementById("eight");

var nine = document.getElementById("nine");

var zero = document.getElementById("zero");

var clear = document.getElementById("clear");

var add = document.getElementById("add");

var subtract = document.getElementById("subtract");

var multiply = document.getElementById("multiply");

var divide = document.getElementById("divide");

var equals = document.getElementById("equals");

var input = "";

var operator = "";

var firstNumber = 0;

one.onclick = function() {

result.innerHTML = input += "1";

}

two.onclick = function() {

result.innerHTML = input += "2";

}

three.onclick = function() {

result.innerHTML = input += "3";

}

four.onclick = function() {

result.innerHTML = input += "4";

}

five.onclick = function() {

result.innerHTML = input += "5";

}

six.onclick = function() {

result.innerHTML = input += "6";

}

seven.onclick = function() {

result.innerHTML = input += "7";

}

eight.onclick = function() {

result.innerHTML = input += "8";

}

nine.onclick = function() {

result.innerHTML = input += "9";

}

zero.onclick = function() {

result.innerHTML = input += "0";

}

clear.onclick = function()

result.innerHTML = "0";

input = "";

operator = "";

firstNumber = 0;

add.onclick = function() {

if (input !== "") {

firstNumber = parseFloat(input);

operator = "+";

input = "";

}

}

subtract.onclick = function() {

if (input !== "") {

firstNumber = parseFloat(input);

operator = "-";

input = "";

}

}

multiply.onclick = function() {

if (input !== "") {

firstNumber = parseFloat(input);

operator = "*";

input = "";

}

}

divide.onclick = function() {

if (input !== "") {

firstNumber = parseFloat(input);

operator = "/";

input = "";

}

}

equals.onclick = function() {

var secondNumber = parseFloat(input);

if (operator === "+") {

result.innerHTML = firstNumber + secondNumber;

input = firstNumber + secondNumber;

}

if (operator === "-")

result.innerHTML = firstNumber - secondNumber;

input = firstNumber - secondNumber;

if (operator === "*") {

result.innerHTML = firstNumber * secondNumber;

input = firstNumber * secondNumber;

}

if (operator === "/")

result.innerHTML = firstNumber / secondNumber;

input = firstNumber / secondNumber;

}

}

最后,我们将这些代码存为名为“calculator.html”的文件,并将JavaScript代码存为名为“calculator.js”的文件。在我们打开这个网页时,将会看到一个简单的计算器,可以实现基本的数学运算。

标题:JavaScript简易计算器代码,带有HTML和CSS示例

  
  

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