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57 lines
1.8 KiB
57 lines
1.8 KiB
<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<title>简单计算器</title>
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</head>
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<body>
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<div class="container">
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<h2>简易计算器</h2>
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<input type="number" id="num1" placeholder="输入第一个数字" required>
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<input type="number" id="num2" placeholder="输入第二个数字" required>
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<select id="operation">
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<option value="add">加 (+)</option>
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<option value="subtract">减 (-)</option>
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<option value="multiply">乘 (*)</option>
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<option value="divide">除 (/)</option>
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<option value="modulus">模 (%)</option>
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</select>
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<button onclick="calculate()">计算</button>
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<p id="result"></p>
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</div>
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<script>
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function calculate() {
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var num1 = parseFloat(document.getElementById('num1').value);
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var num2 = parseFloat(document.getElementById('num2').value);
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var operation = document.getElementById('operation').value;
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var result;
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switch(operation) {
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case 'add':
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result = num1 + num2;
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break;
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case 'subtract':
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result = num1 - num2;
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break;
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case 'multiply':
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result = num1 * num2;
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break;
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case 'divide':
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if(num2 !== 0) {
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result = num1 / num2;
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} else {
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result = '除数不能为0';
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}
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break;
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case 'modulus':
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result = num1 % num2;
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break;
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}
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document.getElementById('result').innerText = '结果: ' + result;
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}
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</script>
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</body>
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</html> |