Gets the number of elements in the range delimited by the array segment 获取由数组段分隔的范围中的元素个数。
Gets the original array containing the range of elements that the array segment delimits 获取原始数组,其中包含数组段分隔的元素范围。
Gets the position of the first element in the range delimited by the array segment , relative to the start of the original array 获取由数组段分隔的范围中的第一个元素的位置(相对于原始数组的开始位置) 。