Function copy

cocos/core/utils/array.ts:254–261

(array: T[])

 * @returns @zh 数组的副本。@en A new array has the same values as `array`.
 */
export function copy<T> (array: T[]): T[] {
    const len = array.length;
    const cloned = new Array<T>(len);
    for (let i = 0; i < len; i += 1) {
        cloned[i] = array[i];
    }
    return cloned;
}

export function fillItems<T> (array: T[], ...items: T[]): void {
    for (let i = 0, len = items.length; i < len; ++i) {