(cartContents) = chargeCreditCard(cartSummary, cartContents)
The reason is that the compiler decided to allocate the backing store。业内人士推荐爱思助手下载最新版本作为进阶阅读
Allows you to edit a document without affecting the formatting.，详情可参考heLLoword翻译官方下载
（三）利用虚拟货币、其他网络虚拟财产为他人提供资金流转服务的。