function convertBase() {
    const inputNumber = document.getElementById('inputNumber').value.trim();
    const fromBase = parseInt(document.getElementById('fromBase').value);
    const toBase = parseInt(document.getElementById('toBase').value);

    // 验证输入数字是否符合fromBase的规则
    if (!isValidNumber(inputNumber, fromBase)) {
        alert('输入的数字无效！请检查其进制格式。');
        return;
    }

    // 将输入的数字从fromBase转换为十进制
    const decimalValue = parseInt(inputNumber, fromBase);

    // 将十进制数转换为toBase
    const result = decimalValue.toString(toBase).toUpperCase();
    document.getElementById('result').textContent = `转换结果: ${result}`;
}

function isValidNumber(num, base) {
    const validChars = '0123456789ABCDEF'.slice(0, base);
    for (let char of num.toUpperCase()) {
        if (!validChars.includes(char)) {
            return false;
        }
    }
    return true;
}