js 重构if多层

if (status === 'success') {
    // 处理成功逻辑
} else if (status === 'error') {
    // 处理错误逻辑
} else if (status === 'pending') {
    // 处理待处理逻辑
} else {
    // 处理其他逻辑
}

switch (status) {
    case 'success':
        // 处理成功逻辑
        break;
    case 'error':
        // 处理错误逻辑
        break;
    case 'pending':
        // 处理待处理逻辑
        break;
    default:
        // 处理其他逻辑
}

if (command === 'start') {
    startProcess();
} else if (command === 'stop') {
    stopProcess();
} else if (command === 'restart') {
    restartProcess();
} else {
    console.log('Unknown command');
}

const commandMap = {
    start: startProcess,
    stop: stopProcess,
    restart: restartProcess
};

if (commandMap[command]) {
    commandMap[command]();
} else {
    console.log('Unknown command');
}

if (user.isAdmin) {
    if (user.isActive) {
        grantFullAccess();
    } else {
        grantLimitedAccess();
    }
} else {
    if (user.isActive) {
        grantUserAccess();
    } else {
        denyAccess();
    }
}

function checkAdminAccess(user) {
    if (user.isAdmin && user.isActive) {
        grantFullAccess();
    } else if (user.isAdmin) {
        grantLimitedAccess();
    } else if (user.isActive) {
        grantUserAccess();
    } else {
        denyAccess();
    }
}

checkAdminAccess(user);

if (paymentMethod === 'creditCard') {
    processCreditCardPayment();
} else if (paymentMethod === 'paypal') {
    processPaypalPayment();
} else if (paymentMethod === 'bankTransfer') {
    processBankTransferPayment();
} else {
    throw new Error('Unsupported payment method');
}

const paymentStrategies = {
    creditCard: processCreditCardPayment,
    paypal: processPaypalPayment,
    bankTransfer: processBankTransferPayment
};

const paymentFunction = paymentStrategies[paymentMethod];
if (paymentFunction) {
    paymentFunction();
} else {
    throw new Error('Unsupported payment method');
}