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1 month ago · 350bccaeb6
commit 350bccaeb6
1 changed files with 149 additions and 0 deletions
--- a/jsq.html
+++ b/jsq.html
@ -0,0 +1,149 @@
 <!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: 10px;
            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>
        </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;
                default:
                    return;
            }
            currentOperand = computation.toString();
            operation = undefined;
            previousOperand = '';
            updateDisplay();
        }
        function clearDisplay() {
            currentOperand = '';
            previousOperand = '';
            operation = undefined;
            updateDisplay();
        }
        function updateDisplay() {
            display.value = currentOperand;
        }
    </script>
 </body>
 </html>