iframe下处理#document的方法

支持 iframe 的浏览器在子窗口中显示 URL 引用的文档，通常带有垂直和/或水平滚动条.这样的浏览器会忽略 iframe 元素的内容(即开始标签 和结束标签 之间的所有内容).不支持 iframe(或禁用此类支持)的浏览器则相反，即处理内容就像 <iframe...> 和 </iframe> 标签不存在.因此，尽管被某些浏览器忽略，但内容很重要.

Browsers which support iframe display the document referred to by the URL in a subwindow, typically with vertical and/or horizontal scroll bars. Such browsers ignore the content of the iframe element (i.e. everything between the start tag <iframe...> and the end tag </iframe>). Browsers which do not support iframe (or have such support disabled) does the opposite, i.e. process the content as if the <iframe...> and </iframe> tags were not there. Thus, the content matters, despite being ignored by some browsers.

总而言之，内联框架并不意味着包含功能，尽管它有时可能起到类似的作用.

So to summarize, inline frames do not mean an include feature, although it might sometimes serve similar purposes.

请注意，当使用内联框架时，浏览器(如果它支持它们)会向 iframe 元素中的 URL 引用的服务器发送请求，并在获取请求的文档将其显示在一个内联框架内.从这个意义上说，内联框架是一个联合浏览器-服务器问题，但只有浏览器需要专门识别 iframe；从服务器的角度来看，这只是一个对文档的普通 HTTP 请求，它发送文档而不知道(或不需要)浏览器将要做什么.

Note that, when inline frames are used, the browser (if it supports them) sends a request to the server referred to by the URL in the iframe element, and after getting the requested document displays it inside an inline frame. In this sense inline frames are a joint browser-server issue, but only the browser needs to be specifically iframe-aware; from the server's point of view, there's just a normal HTTP request for a document, and it sends the document without having (or needing) any idea on what the browser is going to do with it.

根据 最佳实践，在切换到 iframe 时，您需要如下诱导 WebDriverWait:

As per the best practices while switching to an iframe you need to induce WebDriverWait as follows:

• 切换Frame Name(Java 示例代码):

• Switch through Frame Name (Java Sample Code):

new WebDriverWait(driver, 20).until(ExpectedConditions.frameToBeAvailableAndSwitchToIt(By.name("frame_name")));

切换 iframe XPath(Python 示例代码):

Switch through iframe XPath (Python Sample Code):

WebDriverWait(driver, 10).until(EC.frame_to_be_available_and_switch_to_it((By.XPATH,"//iframe[@id='ptifrmtgtframe' and @name='TargetContent']")))

切换iframe CssSelector(C#示例代码):

new WebDriverWait(driver, TimeSpan.FromSeconds(20)).Until(ExpectedConditions.FrameToBeAvailableAndSwitchToIt(By.CssSelector("iframe#twitter-widget-0")));