Home >Common Problem >What is the principle of iframe

What is the principle of iframe

小老鼠Original: 2023-08-23 17:35:321272browse

The principle of iframe is to insert an tag into an HTML document and set the src attribute to point to the URL of the web page or document to be embedded. When the browser parses the <iframe> tag, it creates a separate browsing context, loads the specified URL, and displays its content in an embedded frame. This frame can set properties such as width, height, and borders to control its display on the page. </p></blockquote> <p><img src="https://img.php.cn/upload/article/202308/23/2023082317340086961.jpg" alt="What is the principle of iframe" ></p> <p>The operating environment of this tutorial: Windows 10 system, Dell G3 computer. </p> <p>iframe (inline frame) is a tag in HTML used to embed other web pages or documents in a web page. It allows developers to embed a web page into another web page, thereby displaying multiple independent content on the same page. This embedding method can display content from other websites, advertisements, maps, etc. in the web page. </p> <p>The principle of iframe is to insert an <iframe> tag into an HTML document and set the src attribute to point to the URL of the web page or document to be embedded. When the browser parses the <iframe> tag, it creates a separate browsing context, loads the specified URL, and displays its content in an embedded frame. This frame can set properties such as width, height, and borders to control its display on the page. </p> <p>In an iframe, the embedded web page or document can run independently from the main page and has its own DOM structure, CSS style and JavaScript execution environment. This means that content from other websites can be loaded and displayed in the iframe without being affected by the main page. At the same time, iframe also provides some attributes and methods that can interact with embedded pages through JavaScript, such as obtaining the content of the embedded page, modifying its style, calling its methods, etc. </p> <p>However, due to the independence of iframe, it also has some security and performance issues. First, since iframes can load content from other websites, there may be security issues with cross-domain access. To solve this problem, browsers usually restrict access to iframes, such as prohibiting cross-domain scripts from accessing embedded pages. Secondly, since the content loaded by iframe is independent, it requires additional network requests and resource loading, which may affect the loading speed and performance of the page. </p> <p>Therefore, you need to pay attention to some issues when using iframe. First, you should ensure that the embedded content is trustworthy to avoid security risks. Secondly, iframes should be used rationally and avoid excessive nesting and overuse to reduce the impact on page performance. Finally, if you need to interact with embedded pages, you should use secure methods to avoid potential security vulnerabilities. </p> <p>In summary, an iframe is a tag that embeds other web pages or documents in a web page, and loads and displays the embedded content by creating an independent browsing context. It provides a flexible way to display multiple independent content, but also requires attention to security and performance issues. </p><p>The above is the detailed content of What is the principle of iframe. For more information, please follow other related articles on the PHP Chinese website!</p></div><div class="nphpQianMsg"><a href="javascript:void(0);">JavaScript</a> <a href="javascript:void(0);">css</a> <a href="javascript:void(0);">html</a> <a href="javascript:void(0);">dom</a><div class="clear"></div></div><div class="nphpQianSheng"><span>Statement：</span><div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn</div></div></div><div class="nphpSytBox"><span>Previous article：<a class="dBlack" title="What are the disadvantages of iframe" href="https://m.php.cn/faq/595466.html">What are the disadvantages of iframe</a></span><span>Next article：<a class="dBlack" title="What are the disadvantages of iframe" href="https://m.php.cn/faq/595474.html">What are the disadvantages of iframe</a></span></div><div class="nphpSytBox2"><div class="nphpZbktTitle"><h2>Related articles</h2><em><a href="https://m.php.cn/article.html" class="bBlack"><i>See more</i><b></b></a></em><div class="clear"></div></div><ins class="adsbygoogle" style="display:block" data-ad-format="fluid" data-ad-layout-key="-6t+ed+2i-1n-4w" data-ad-client="ca-pub-5902227090019525" data-ad-slot="8966999616"></ins><script> (adsbygoogle = window.adsbygoogle || []).push({}); </script><ul class="nphpXgwzList"><li><b></b><a href="https://m.php.cn/faq/394082.html" title="Use Jquery to get Dom elements in iframe pages" class="aBlack">Use Jquery to get Dom elements in iframe pages</a><div class="clear"></div></li><li><b></b><a href="https://m.php.cn/faq/410795.html" title="How to introduce external pages in HTML (iframe tag method)" class="aBlack">How to introduce external pages in HTML (iframe tag method)</a><div class="clear"></div></li><li><b></b><a href="https://m.php.cn/faq/436400.html" title="Introduction to layui's iframe jump link and page button jump" class="aBlack">Introduction to layui's iframe jump link and page button jump</a><div class="clear"></div></li><li><b></b><a href="https://m.php.cn/faq/465154.html" title="How does jquery determine whether the iframe is loaded?" class="aBlack">How does jquery determine whether the iframe is loaded?</a><div class="clear"></div></li></ul></div></div><ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-5902227090019525" data-ad-slot="5027754603"></ins><script> (adsbygoogle = window.adsbygoogle || []).push({}); </script><footer><div class="footer"><div class="footertop"><img src="/static/imghwm/logo.png" alt=""><p>Public welfare online PHP training，Help PHP learners grow quickly！</p></div><div class="footermid"><a href="https://m.php.cn/about/us.html">About us</a><a href="https://m.php.cn/about/disclaimer.html">Disclaimer</a><a href="https://m.php.cn/update/article_0_1.html">Sitemap</a></div><div class="footerbottom"><p> © php.cn All rights reserved </p></div></div></footer><script>isLogin = 0;</script><script type="text/javascript" src="/static/layui/layui.js"></script><script type="text/javascript" src="/static/js/global.js?4.9.47"></script></div><script src="https://vdse.bdstatic.com//search-video.v1.min.js"></script><link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css' type='text/css' media='all'/><script type='text/javascript' src='/static/js/viewer.min.js?1'></script><script type='text/javascript' src='/static/js/jquery-viewer.min.js'></script><script>jQuery.fn.wait = function (func, times, interval) { var _times = times || -1, //100次 _interval = interval || 20, //20毫秒每次 _self = this, _selector = this.selector, //选择器 _iIntervalID; //定时器id if( this.length ){ //如果已经获取到了，就直接执行函数 func && func.call(this); } else { _iIntervalID = setInterval(function() { if(!_times) { //是0就退出 clearInterval(_iIntervalID); } _times <= 0 || _times--; //如果是正数就 -- _self = $(_selector); //再次选择 if( _self.length ) { //判断是否取到 func && func.call(_self); clearInterval(_iIntervalID); } }, _interval); } return this; } $("table.syntaxhighlighter").wait(function() { $('table.syntaxhighlighter').append("<p class='cnblogs_code_footer'><span class='cnblogs_code_footer_icon'></span></p>"); }); $(document).on("click", ".cnblogs_code_footer",function(){ $(this).parents('table.syntaxhighlighter').css('display','inline-table');$(this).hide(); }); $('.nphpQianCont').viewer({navbar:true,title:false,toolbar:false,movable:false,viewed:function(){$('img').click(function(){$('.viewer-close').trigger('click');});}}); </script></body></html>