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@ -1,87 +0,0 @@
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<!DOCTYPE html>
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<html>
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<head>
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<title>简单计算器</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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}
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input[type="text"], select {
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width: 100px;
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padding: 4px;
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margin: 5px 0;
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}
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button {
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padding: 10px;
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margin: 10px 0;
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}
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</style>
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<script>
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function calculate() {
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var firstNumber = document.getElementById("firstNumber").value;
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var secondNumber = document.getElementById("secondNumber").value;
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var operation = document.getElementById("operation").value;
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var result;
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// 验证输入是否为数字
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if (isNaN(firstNumber) || isNaN(secondNumber)) {
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alert("请输入有效的数字");
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return;
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}
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firstNumber = parseFloat(firstNumber);
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secondNumber = parseFloat(secondNumber);
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switch (operation) {
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case "+":
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result = firstNumber + secondNumber;
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break;
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case "-":
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result = firstNumber - secondNumber;
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break;
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case "*":
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result = firstNumber * secondNumber;
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break;
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case "/":
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if (secondNumber !== 0) {
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result = firstNumber / secondNumber;
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} else {
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alert("除数不能为0");
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return;
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}
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break;
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default:
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alert("无效的操作");
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return;
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}
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document.getElementById("result").value = result;
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}
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</script>
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</head>
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<body>
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<h1>简单计算器</h1>
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<form>
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<label for="firstNumber">第一个数：</label>
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<input type="text" id="firstNumber" placeholder="输入数字" required /><br /><br />
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<label for="secondNumber">第二个数：</label>
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<input type="text" id="secondNumber" placeholder="输入数字" required /><br /><br />
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<label for="operation">操作：</label>
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<select id="operation" required>
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<option value="+">加 (+)</option>
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<option value="-">减 (-)</option>
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<option value="*">乘 (*)</option>
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<option value="/">除 (/)</option>
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</select><br /><br />
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<input type="button" value="计算" onclick="calculate()" /><br /><br />
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<label for="result">结果：</label>
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<input type="text" id="result" readonly /><br /><br />
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</form>
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</body>
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</html>
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