====跟单（跟单请说明id/contact/item/qty/link/price）id
contact
item
qty (实际要的数量） 比如qty: 2 (buy one get 1 free)
link
price
跟单
ID: o_penny
Item: GNC Calcimate Plus 800 (500 Caplets)
Qty: 4 (buy 2 get 2 free)
Price: 29.99
Link: product/index.jsp?productId=11127256
Item: GNC Calcimate Plus 800 (500 Caplets)
Qty: 4 (buy 2 get 2 free)
Price: 29.99
Link: product/index.jsp?productId=11127256
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