Call can throw but it is not marked with try

错误原因：

let dic =  NSJSONSerialization.JSONObjectWithData(datas!, options: .MutableContainers)

正确写法:

        do {

                let jsonData = try NSJSONSerialization.JSONObjectWithData(datas!, options: .MutableContainers)

                print(jsonData)

               

            } catch {

               

            }