將string字符串轉換為array數組

?NSArray? *array = [Str componentsSeparatedByString:@","];

＝＝反向方法

將array數組轉換為string字符串

?NSString *tempString = [mutableArray componentsJoinedByString:@","];--,是分隔符

可不加分隔符，就直接連接成字符串

?NSString *tempString = [mutableArray componentsJoinedByString:@""];