作者简介:练习时长两年半的Java up主
个人主页:程序员老茶
ps:点赞是免费的,却可以让写博客的作者开心好久好久
系列专栏:Java全栈,计算机系列(火速更新中)
格言:种一棵树最好的时间是十年前,其次是现在
动动小手,点个关注不迷路,感谢宝子们一键三连
HTML:
DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Calculatortitle>
<link rel="stylesheet" href="style.css">
head>
<body>
<div class="calculator">
<div class="output">
<input type="text" id="result" disabled>
div>
<div class="btn-row">
<button class="operator" id="clear">Cbutton>
<button class="operator" id="backspace">CEbutton>
<button class="operator" id="divide">/button>
<button class="operator" id="multiply">*button>
div>
<div class="btn-row">
<button class="number" id="7">7button>
<button class="number" id="8">8button>
<button class="number" id="9">9button>
<button class="operator" id="minus">-button>
div>
<div class="btn-row">
<button class="number" id="4">4button>
<button class="number" id="5">5button>
<button class="number" id="6">6button>
<button class="operator" id="plus">+button>
div>
<div class="btn-row">
<button class="number" id="1">1button>
<button class="number" id="2">2button>
<button class="number" id="3">3button>
<button class="operator" id="equals">=button>
div>
<div class="btn-row">
<button class="number" id="0">0button>
<button class="operator" id="decimal">.button>
div>
div>
<script src="app.js">script>
body>
html>
CSS:
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: Arial, sans-serif;
}
.calculator {
margin: 50px auto;
width: 300px;
background-color: #eee;
border-radius: 10px;
padding: 20px;
box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}
.output {
margin-bottom: 20px;
}
#result {
width: 100%;
font-size: 2em;
text-align: right;
padding: 5px;
background-color: #fff;
border: none;
border-radius: 5px;
box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
}
.btn-row {
display: flex;
justify-content: space-between;
margin-bottom: 5px;
}
button {
background-color: #fff;
color: #333;
font-size: 1.5em;
border: none;
border-radius: 5px;
padding: 10px;
width: 70px;
height: 70px;
box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
cursor: pointer;
transition: all 0.3s ease;
}
button:hover {
background-color: #333;
color: #fff;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}
.number {
background-color: #eee;
}
.operator {
background-color: #f2a53f;
color: #fff;
}
.btn-row:last-child button {
width: 150px;
}
.btn-row:last-child button#decimal {
width: 70px;
}
.btn-row:last-child button#0 {
width: 150px;
}
JavaScript:
//获取DOM元素
const result = document.getElementById("result");
const clearBtn = document.getElementById("clear");
const backspaceBtn = document.getElementById("backspace");
const divideBtn = document.getElementById("divide");
const multiplyBtn = document.getElementById("multiply");
const minusBtn = document.getElementById("minus");
const plusBtn = document.getElementById("plus");
const equalsBtn = document.getElementById("equals");
const decimalBtn = document.getElementById("decimal");
const numberBtns = document.querySelectorAll(".number");
let currentOperation = null;
let firstOperand = null;
//添加事件监听器
clearBtn.addEventListener("click", () => {
resetCalculator();
});
backspaceBtn.addEventListener("click", () => {
result.value = result.value.slice(0, -1);
});
divideBtn.addEventListener("click", () => {
setOperation("/");
});
multiplyBtn.addEventListener("click", () => {
setOperation("*");
});
minusBtn.addEventListener("click", () => {
setOperation("-");
});
plusBtn.addEventListener("click", () => {
setOperation("+");
});
equalsBtn.addEventListener("click", () => {
if (currentOperation !== null) {
compute();
currentOperation = null;
}
});
decimalBtn.addEventListener("click", () => {
if (!result.value.includes(".")) {
result.value += ".";
}
});
numberBtns.forEach((button) => {
button.addEventListener("click", () => {
if (result.value === "0") {
result.value = button.innerText;
} else {
result.value += button.innerText;
}
});
});
//重置计算器
function resetCalculator() {
currentOperation = null;
firstOperand = null;
result.value = "0";
}
//设置操作符
function setOperation(operator) {
if (currentOperation !== null) {
compute();
}
currentOperation = operator;
firstOperand = parseFloat(result.value);
result.value = "0";
}
//计算结果
function compute() {
const secondOperand = parseFloat(result.value);
let resultValue;
switch (currentOperation) {
case "+":
resultValue = firstOperand + secondOperand;
break;
case "-":
resultValue = firstOperand - secondOperand;
break;
case "*":
resultValue = firstOperand * secondOperand;
break;
case "/":
resultValue = firstOperand / secondOperand;
break;
default:
return;
}
result.value = resultValue;
firstOperand = resultValue;
}
这是一个基础的计算器,可以进行加、减、乘、除运算,并且支持小数点。如果需要增加新的功能,比如开方、取反、取余等,只需在HTML中添加相应的按钮,并在JavaScript中添加相应的事件监听器和函数即可。
往期专栏 |
---|
Java全栈开发 |
数据结构与算法 |
计算机组成原理 |
操作系统 |
数据库系统 |
物联网控制原理与技术 |