取得指定位置上的元素，并将此阵列视为以零起始的一维阵列。
Gets the element at the given position, treating the array as a zero-based, single-dimensional array.
色彩矩阵的元素是根据先列后行的顺序来编列索引 （以零起始）。
The elements of a color matrix are indexed (zero-based) by row and then column.
搜寻指定的子字串，并传回来源字串内第一个相符项目的以零起始的索引。
Searches for the specified character and returns the zero-based index of the first occurrence within the entire source string.
搜寻指定的子字串，并传回来源字串内第一个相符项目的以零起始的索引。
Searches for the specified character and returns the zero-based index of the first occurrence within the entire source string.
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