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<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>简易计算器</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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display: flex;
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justify-content: center;
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align-items: center;
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height: 100vh;
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background-color: #f4f4f4;
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}
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.calculator {
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background: white;
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padding: 20px;
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border-radius: 10px;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
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width: 300px;
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}
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input[type="text"] {
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width: 100%;
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padding: 10px;
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margin-bottom: 10px;
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border: 1px solid #100909;
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border-radius: 5px;
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text-align: right;
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font-size: 1.5em;
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}
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button {
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width: 60px;
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height: 60px;
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margin: 5px;
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border: none;
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border-radius: 5px;
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cursor: pointer;
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background-color: #eaedf1;
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color: rgb(145, 10, 10);
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font-size: 1.5em;
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}
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</style>
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</head>
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<body>
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<div class="calculator">
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<input type="text" id="display" placeholder="0" disabled>
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<div>
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<button onclick="appendToDisplay('7')">7</button>
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<button onclick="appendToDisplay('8')">8</button>
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<button onclick="appendToDisplay('9')">9</button>
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<button class="operator" onclick="appendToDisplay('/')">÷</button>
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</div>
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<div>
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<button onclick="appendToDisplay('4')">4</button>
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<button onclick="appendToDisplay('5')">5</button>
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<button onclick="appendToDisplay('6')">6</button>
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<button class="operator" onclick="appendToDisplay('*')">×</button>
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</div>
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<div>
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<button onclick="appendToDisplay('1')">1</button>
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<button onclick="appendToDisplay('2')">2</button>
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<button onclick="appendToDisplay('3')">3</button>
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<button class="operator" onclick="appendToDisplay('-')">−</button>
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</div>
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<div>
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<button onclick="appendToDisplay('0')">0</button>
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<button class="clear" onclick="clearDisplay()">C</button>
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<button class="operator" onclick="calculateResult()">=</button>
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<button class="operator" onclick="appendToDisplay('+')">+</button>
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</div>
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<div>
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<button class="operator" onclick="appendToDisplay('%')">%</button>
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</div>
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</div>
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<script>
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function appendToDisplay(value) {
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const display = document.getElementById('display');
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if (display.value === "0") {
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display.value = value; // Replace zero if it's the first number
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} else {
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display.value += value; // Append the value
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}
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}
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function clearDisplay() {
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document.getElementById('display').value = '0';
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}
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function calculateResult() {
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const display = document.getElementById('display');
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try {
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// Replace symbols for eval
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let expression = display.value.replace(/×/, '*').replace(/÷/, '/');
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display.value = eval(expression);
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} catch (error) {
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display.value = "错误";
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}
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}
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</script>
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</body>
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</html>
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