app内webView元素定位

解决办法：

1、切换到webView，对页面源码进行打印

        # self.driver.switch_to.context("WEBVIEW_xweb")
        # print(self.driver.context)
        p = self.driver.page_source
        with open('123.html','wb') as f:
            f.write(p.encode('utf-8'))

参考文档：https://www.cnblogs.com/qican/p/12198210.html