如何在回調函數中傳遞原始請求？

Question

我試圖通過命名函數來避免回調地獄，但我無法請求傳遞不屬於原始範圍的對象？的父方法。

這裏是我試圖優化工作代碼：

//req exists, as this is inside an Express route handler 
charge.create({ 
    amount: req.body.amount 
    //... 
}, function(err, createdCharge) { 
     console.log('Purchased: '+req.body.product); 
     res.send('Success'); 
} 

當我嘗試模塊化我的代碼，我就如何通過REQ對象不確定，因爲charge.create方法是什麼我沒有，所以我不能讓它接受任何其他參數：

charge.create({ 
    amount: req.body.amount 
    //... 
}, confirmCharge); 

function confirmCharge(err, createdCharge) { 
     console.log('Purchased: '+req.body.product); //req doesn't exist! 
} 

Answer 1

charge.create({ 
    amount: req.body.amount 
    //... 
}, confirmCharge(req)); 

function confirmCharge(req) { 
     console.log('Purchased: '+req.body.product); //req exists! 
}