按降序排序表科特林例

科特林sortedby降

inline fun <T, R : Comparable<R>> Array<out T>.sortedByDescending(
    crossinline selector: (T) -> R?
): List<T>

inline fun <T, R : Comparable<R>> Iterable<T>.sortedByDescending(
    crossinline selector: (T) -> R?
): List<T>