var error:NSError?
        let a = NSString(contentsOfFile: "/Users/ht/Documents/12.txt", encoding: NSUTF8StringEncoding, error: &error)
        
        println("error = \(error?.localizedDescription)")
        println("a = \(a)")
        
        
        for i in 0 ..< 999{
            let a = NSString(contentsOfFile: "/Users/ht/Documents/12.txt", encoding: UInt(i), error: &error)
            
            if a != nil{
                println(">>>>>>>>>调试<<<<<<<<<<<<<<")
                println("i = \(i)")
                println("a = \(a)")
                println(">>>>>>>>>>>>!<<<<<<<<<<<<<<")
            }
        }
我用NSUTF8StringEncoding编码读取不了,是nil,,用下面那个可以读取10次,但里面有出现ÁªÍ¨ÍøÂçÕ˺Å这样的,不认识的,全中文的没有请指点