Function findReact

（改）网盘直链下载助手.user.js:1884–1910

* 查找 React 组件实例 * @author 油小猴 * @description 支持 Fiber 架构遍历，可指定向上查找层级 * @param {HTMLElement} dom - 起始 DOM 元素 * @param {Number} [traverseUp=0] - 向上遍历层级 * @returns {Object|null} React 组件实例或 `null`

(dom, traverseUp = 0)

		 * @returns {Object|null} React 组件实例或 `null`
		 */
		findReact(dom, traverseUp = 0) {
			let key = Object.keys(dom).find(key => {
				return key.startsWith("__reactFiber$")
					|| key.startsWith("__reactInternalInstance$");
			});
			let domFiber = dom[key];
			if (domFiber == null) return null;
			if (domFiber._currentElement) {
				let compFiber = domFiber._currentElement._owner;
				for (let i = 0; i < traverseUp; i++) {
					compFiber = compFiber._currentElement._owner;
				}
				return compFiber._instance;
			}
			let GetCompFiber = fiber => {
				let parentFiber = fiber.return;
				while (base.isType(parentFiber.type) == "string") {
					parentFiber = parentFiber.return;
				}
				return parentFiber;
			};
			let compFiber = GetCompFiber(domFiber);
			for (let i = 0; i < traverseUp; i++) {
				compFiber = GetCompFiber(compFiber);
			}
			return compFiber.stateNode || compFiber;
		},

		/**
		 * 深拷贝