for i in 0..<results!.count{
let resultItem = results![i] as? Result
let updateResultItem = Result(className: "Result", objectId: (resultItem?.objectId)!)
updateResultItem.setObject(i + 1, forKey: "ranking")
resultItem?.ranking = Int32( i + 1 )
updateResults.append(updateResultItem)
}
a..< b 表示 a<x<b 之间的数
a...b 表示 a<= x <= b
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