You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
153 lines
4.2 KiB
153 lines
4.2 KiB
<!DOCTYPE html>
|
|
<html lang="zh-CN">
|
|
<head>
|
|
<meta charset="UTF-8">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
<title>简单计算器</title>
|
|
<style>
|
|
body {
|
|
display: flex;
|
|
justify-content: center;
|
|
align-items: center;
|
|
height: 100vh;
|
|
margin: 0;
|
|
font-family: Arial, sans-serif;
|
|
background-color: #f0f0f0;
|
|
}
|
|
|
|
.calculator {
|
|
background-color: #444;
|
|
padding: 20px;
|
|
border-radius: 10px;
|
|
box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
|
|
}
|
|
|
|
#display {
|
|
width: 100%;
|
|
height: 50px;
|
|
margin-bottom: 10px;
|
|
padding: 0px;
|
|
font-size: 24px;
|
|
text-align: right;
|
|
border: none;
|
|
background-color: #fff;
|
|
border-radius: 5px;
|
|
}
|
|
|
|
.buttons {
|
|
display: grid;
|
|
grid-template-columns: repeat(4, 1fr);
|
|
gap: 10px;
|
|
}
|
|
|
|
button {
|
|
padding: 20px;
|
|
font-size: 20px;
|
|
border: none;
|
|
border-radius: 5px;
|
|
background-color: #666;
|
|
color: white;
|
|
cursor: pointer;
|
|
transition: background-color 0.2s;
|
|
}
|
|
|
|
button:hover {
|
|
background-color: #888;
|
|
}
|
|
|
|
button:active {
|
|
background-color: #555;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<div class="calculator">
|
|
<input type="text" id="display" disabled>
|
|
<div class="buttons">
|
|
<button onclick="clearDisplay()">C</button>
|
|
<button onclick="appendNumber('7')">7</button>
|
|
<button onclick="appendNumber('8')">8</button>
|
|
<button onclick="appendNumber('9')">9</button>
|
|
<button onclick="chooseOperation('/')">/</button>
|
|
<button onclick="appendNumber('4')">4</button>
|
|
<button onclick="appendNumber('5')">5</button>
|
|
<button onclick="appendNumber('6')">6</button>
|
|
<button onclick="chooseOperation('*')">*</button>
|
|
<button onclick="appendNumber('1')">1</button>
|
|
<button onclick="appendNumber('2')">2</button>
|
|
<button onclick="appendNumber('3')">3</button>
|
|
<button onclick="chooseOperation('-')">-</button>
|
|
<button onclick="appendNumber('0')">0</button>
|
|
<button onclick="appendNumber('.')">.</button>
|
|
<button onclick="compute()">=</button>
|
|
<button onclick="chooseOperation('+')">+</button>
|
|
<button onclick="chooseOperation('%')">%</button>
|
|
</div>
|
|
</div>
|
|
|
|
<script>
|
|
let currentOperand = '';
|
|
let previousOperand = '';
|
|
let operation = undefined;
|
|
|
|
const display = document.getElementById('display');
|
|
|
|
function appendNumber(number) {
|
|
if (number === '.' && currentOperand.includes('.')) return;
|
|
currentOperand += number;
|
|
updateDisplay();
|
|
}
|
|
|
|
function chooseOperation(op) {
|
|
if (currentOperand === '') return;
|
|
if (previousOperand !== '') {
|
|
compute();
|
|
}
|
|
operation = op;
|
|
previousOperand = currentOperand;
|
|
currentOperand = '';
|
|
}
|
|
|
|
function compute() {
|
|
let computation;
|
|
const prev = parseFloat(previousOperand);
|
|
const current = parseFloat(currentOperand);
|
|
if (isNaN(prev) || isNaN(current)) return;
|
|
switch (operation) {
|
|
case '+':
|
|
computation = prev + current;
|
|
break;
|
|
case '-':
|
|
computation = prev - current;
|
|
break;
|
|
case '*':
|
|
computation = prev * current;
|
|
break;
|
|
case '/':
|
|
computation = prev / current;
|
|
break;
|
|
case '%':
|
|
computation = prev % current;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
currentOperand = computation.toString();
|
|
operation = undefined;
|
|
previousOperand = '';
|
|
updateDisplay();
|
|
}
|
|
|
|
function clearDisplay() {
|
|
currentOperand = '';
|
|
previousOperand = '';
|
|
operation = undefined;
|
|
updateDisplay();
|
|
}
|
|
|
|
function updateDisplay() {
|
|
display.value = currentOperand;
|
|
}
|
|
</script>
|
|
</body>
|
|
</html> |