使用 JavaScript 读取 IFrame 内容 [英] Read IFrame content using JavaScript
问题描述
好的，这是我第一次认真对待 IFrames，我似乎无法理解一些事情:
首先是我正在测试的示例代码:
<script type="text/javascript">函数初始化(){console.log("IFrame 内容:" + window.frames['i1'].document.getElementsByTagName('body')[0].innerHTML);}<body onload="init();"><iframe name="i1" src="foo.txt"/>文件foo.txt"如下所示:
示例文本文件问题:
1) iframe 似乎表现为 HTML 文档，而文件文本实际上是正文的一部分.为什么 ?IFrame 是 HTML 文档的规则.iframe 的内容不能只是纯文本吗??
2) 由于某种原因，文件内容被包裹在 pre 标签中.为什么会这样?总是这样吗?
3) 我在 javascript 中的访问方法正在运行，但还有其他替代方法吗?[请使用原生 js 解决方案] 如果内容始终包含在 pre 标记中，那么我实际上必须在 pre 中查找 标记而不是查找 innerHTML
innerHTML 确实不返回元素的精确内容，它的一种返回 HTML 的非标准化方法，它等价到实际内容，在 HTML 中，等价于纯文本是
foo...</pre>.innerText 财产..
Ok, This is my first time dealing seriously with IFrames and I cant seem to understand a few things:
First the sample code I am testing with:
<head> <script type="text/javascript"> function init(){ console.log("IFrame content: " + window.frames['i1'].document.getElementsByTagName('body')[0].innerHTML); } </script> </head> <body onload="init();"> <iframe name="i1" src="foo.txt"/> </body>the file "foo.txt" looks like this:
sample text fileQuestions:
1) The iframe seems to be behaving as a HTML document and the file text is actually part of the body instead. Why ? Is it a rule for an IFrame to be a HTML document. Is it not possible for the content of an iframe to be just plain text ??
2) The file content gets wrapped inside a pre tag for some reason. Why is this so ? Is it always the case?
3) My access method in the javascript is working but is there any other alternative? [native js solutions please] If the content is wrapped in a pre tag always then I will actually have to lookup inside the pre tag rather than lookup the innerHTML
解决方案
innerHTMLdoes not return the exact content of an element, its a non-standardized method that returns HTML which is equivalent to the real content, and in HTML the equivalent to plain text is<pre>foo...</pre>.You might have better luck with the innerText property..
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