如何为函数回调Javascript添加自定义属性

I have this code

我有这个代码

doPurchase = function(amount) {
  transactionCompleteCallbackImpl.bind(this, amount);
  iclient.initiatePurchase({
    amount: amount,
    cashout: '0',
    integratedReceipt: true
  }, {
    statusMessageCallback: statusMessageCallbackImpl,
    questionCallback: questionCallbackImpl,
    receiptCallback: receiptCallbackImpl,
    transactionCompleteCallback: transactionCompleteCallbackImpl
  });
};
doPurchase = functi