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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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<title>进制转换</title>
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<script>
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function toDecimal(number, base) {
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let decimal = 0;
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let power = 0;
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for (let i = number.length - 1; i >= 0; i--) {
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let digit = number[i];
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let value = parseInt(digit, base);
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if (isNaN(value)) {
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alert(`无效的数字 ${digit} 对于基数 ${base}`);
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return null;
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}
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decimal += value * Math.pow(base, power);
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power++;
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}
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return decimal;
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}
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function fromDecimal(number, base) {
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if (number === 0) {
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return "0";
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}
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let result = "";
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const digits = "0123456789ABCDEF";
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while (number > 0) {
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let remainder = number % base;
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result = digits[remainder] + result;
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number = Math.floor(number / base);
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}
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return result;
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}
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function convert() {
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let sourceBase = document.getElementById('sourceBase').value;
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let sourceNumber = document.getElementById('sourceNumber').value.toUpperCase();
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let targetBase = document.getElementById('targetBase').value;
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if (sourceBase < 2 || sourceBase > 16 || targetBase < 2 || targetBase > 16) {
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alert("基数必须在2到16之间");
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return;
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}
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let decimal = toDecimal(sourceNumber, sourceBase);
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if (decimal !== null) {
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let targetNumber = fromDecimal(decimal, targetBase);
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document.getElementById('result').innerText = `转换后的数是: ${targetNumber}`;
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}
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}
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</script>
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</head>
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<body>
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<h1>进制转换器</h1>
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<form onsubmit="event.preventDefault(); convert();">
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<label for="sourceBase">原始进制（2-16）:</label>
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<input type="number" id="sourceBase" required min="2" max="16"><br><br>
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<label for="sourceNumber">原始数:</label>
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<input type="text" id="sourceNumber" required pattern="[0-9A-Fa-f]*"><br><br>
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<label for="targetBase">目标进制（2-16）:</label>
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<input type="number" id="targetBase" required min="2" max="16"><br><br>
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<button type="submit">转换</button>
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</form>
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<p id="result"></p>
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</body>
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</html>
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