1: Let’s take a look at using css first. You need to write expressions in css, but it flashes and flashes. Assign the variable "ignoreMe", and "document.documentElement.scrollTop? document.documentElement.scrollTop: document.body.scrollTop" (this is a bug in IE).
1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 2 <HTML> 3 <HEAD> 4 <TITLE> css test </TITLE> 5 <style> 6 #LoadingStatus{ 7 position:fixed !important; 8 position:absolute; 9 top:100px;10 top: expression( ( 100 + ( ignoreMe = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop ) ) + 'px' );11 margin:0 0 0 -110px;12 width:220px;height:19px;13 left:50%;14 text-align:center;15 border:1px solid red;16 }17 </style>18 </HEAD>19 <BODY>20 <div id="LoadingStatus" style="display:none;"> loading...</div>21 <div style="height:1024px">22 <input type="button" onclick="document.getElementById('LoadingStatus').style.display=''" value='显示loading' />23 </div> 24 <div>25 <input type="button" onclick="document.getElementById('LoadingStatus').style.display=''" value='显示loading' />26 </div>27 </BODY>28 </HTML> 2: Written in JS, it can actually be applied to css. It is no different from the above. It should be noted that under FF, the upper left and upper right are still floating. Under IE, everything is fixed, but flickering. Which should be used with caution.
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <HTML> 3 <HEAD> 4 <TITLE>JAVASCRIPT</TITLE> 5 <META HTTP-EQUIV="Content-Type" CONTENT="text/html" charset="UTF-8"> 6 </HEAD> 7 <style> 8 <!-- 9 .div {10 position: absolute;11 border: 2px solid red;12 background-color: #EFEFEF;13 line-height:90px;14 font-size:12px;15 z-index:1000;16 }17 -->18 </style>19 <BODY>20 <div id="Javascript.Div1" class="div" style="width: 240px; height:90px" align="center">正中...</div>21 <SCRIPT LANGUAGE="JavaScript">22 function sc1(){23 document.getElementById("Javascript.Div1").style.top=24 document.documentElement.scrollTop+(document.documentElement.clientHeight-document.getElementById("Javascript.Div1").offsetHeight)/2+"px"25 document.getElementById("Javascript.Div1").style.left=26 document.documentElement.scrollLeft+(document.documentElement.clientWidth-document.getElementById("Javascript.Div1").offsetWidth)/2+"px";27 }28 </SCRIPT>29 <div id="Javascript.Div2" class="div" style="width: 240px; height:90px;" align="center">左上...</div>30 <SCRIPT LANGUAGE="JavaScript">31 function sc2(){32 document.getElementById("Javascript.Div2").style.top=document.documentElement.scrollTop;33 document.getElementById("Javascript.Div2").style.left=document.documentElement.scrollLeft;34 }35 </SCRIPT>36 <div id="Javascript.Div3" class="div" style="width: 240px; height:90px;" align="center">左下...</div>37 <SCRIPT LANGUAGE="JavaScript">38 function sc3(){39 document.getElementById("Javascript.Div3").style.top=40 document.documentElement.scrollTop+document.documentElement.clientHeight-document.getElementById("Javascript.Div3").offsetHeight+"px";41 document.getElementById("Javascript.Div3").style.left=document.documentElement.scrollLeft;42 }43 </SCRIPT>44 <div id="Javascript.Div4" class="div" style="width: 240px; height:90px;" align="center">右上...</div>45 <SCRIPT LANGUAGE="JavaScript">46 function sc4(){47 document.getElementById("Javascript.Div4").style.top=document.documentElement.scrollTop;48 document.getElementById("Javascript.Div4").style.left=49 document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("Javascript.Div4").offsetWidth+"px";50 }51 </SCRIPT>52 <div id="Javascript.Div5" class="div" style="width: 240px; height:90px;" align="center">右下...</div>53 <SCRIPT LANGUAGE="JavaScript">54 function sc5(){55 56 document.getElementById("Javascript.Div5").style.top=57 document.documentElement.scrollTop+document.documentElement.clientHeight-document.getElementById("Javascript.Div5").offsetHeight+"px";58 document.getElementById("Javascript.Div5").style.left=59 document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("Javascript.Div5").offsetWidth+"px";60 }61 </SCRIPT>62 <SCRIPT LANGUAGE="JavaScript">63 <!--64 function scall(){65 sc1();sc2();sc3();sc4();sc5();66 }67 window.onscroll=scall;68 window.onresize=scall;69 window.onload=scall;70 //-->71 </SCRIPT>72 <div style="position: absolute; top: 0; left: 0; width: 10000px; height: 4000px;"></div>73 </BODY>74 </HTML> 3: This is still written in js, but it will not flash during the scrolling process of the IE browser. The compatibility effect is very good.
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <meta http-equiv="content-type" charset="utf-8" /> 5 <title>Js跟随滚动条移动的DIV</title> 6 </head> 7 <style type="text/css"> 8 *{margin:0;padding: 0;background-color:#000; } 9 div#con{width: 800px;margin: 0 auto;}10 div.pop{width:800px;font-size: 18px;background:yellow;padding:20px 0;margin:20px auto;border:1px solid yellow;text-align: center;color: #000;}11 p{width:800px;padding:20px 0;background:#fff;border:1px solid #000;margin:20px auto;text-align: center;}12 div.active{position: fixed;top: 100px;z-index: 100;margin: 0;_position: absolute;}13 </style>14 <body>15 <div id="con" style="height:2000px;">16 <p>我是元素p</p>17 <div id="myDiv" class="pop active">18 我是随屏幕滚动的DIV，我距离顶部高度适中为100px，修改css就可以修改该值19 </div>20 21 <p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p>我是元素p</p><p style="color:red;position:fixed;top:400px;">我是元素top:400px;看是否支持固定定位</p>22 </div>23 <script type="text/javascript">24 (function(){25 //if(navigator.userAgent.toLocaleLowerCase().indexOf('msie 6.0;')>1){26 if(checkFixed()){27 return ;28 }//只需对不支持固定定位的浏览器做处理29 30 //将下面需要使用的dom相关操作在scrollDiv外面提取一次，避免多次dom操作31 var fixedObj = document.getElementById("myDiv"),32 height = fixedObj.offsetHeight,//标签高度提前读取出来33 firstTop =getTop(fixedObj),//记录页面一开始标签所在位置34 timer;35 window.onscroll = function(){//这里做个延时执行，可以减少scroll执行频率36 clearTimeout(timer);37 timer = setTimeout(function(){38 scrollDiv()39 },30);40 }41 42 function scrollDiv(){43 var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;44 fixedObj.style.top=(firstTop+scrollTop)+'px';45 }46 //获取元素在页面里top值47 function getTop(obj) {48 var top = 0;49 while(obj){50 top += obj.offsetTop;51 obj = obj.offsetParent;52 }53 return top;54 }55 //判断浏览器是否支持固定定位56 function checkFixed(){57 var o = document.createElement('div'),58 body = document.getElementsByTagName('body')[0],59 fig = false;60 body.insertBefore( o, body.firstChild );61 o.style.cssText ='position:fixed;top:20px;margin:0;padding:0;border:none;width:0px;height:0px;';62 fig = o.offsetTop==20;63 body.removeChild(o);64 return fig;65 }66 })()67 </script>68 </body>69 </html>
Beyond HTML: Essential Technologies for Web DevelopmentApr 26, 2025 am 12:04 AMTo build a website with powerful functions and good user experience, HTML alone is not enough. The following technology is also required: JavaScript gives web page dynamic and interactiveness, and real-time changes are achieved by operating DOM. CSS is responsible for the style and layout of the web page to improve aesthetics and user experience. Modern frameworks and libraries such as React, Vue.js and Angular improve development efficiency and code organization structure.
What are boolean attributes in HTML? Give some examples.Apr 25, 2025 am 12:01 AMBoolean attributes are special attributes in HTML that are activated without a value. 1. The Boolean attribute controls the behavior of the element by whether it exists or not, such as disabled disable the input box. 2.Their working principle is to change element behavior according to the existence of attributes when the browser parses. 3. The basic usage is to directly add attributes, and the advanced usage can be dynamically controlled through JavaScript. 4. Common mistakes are mistakenly thinking that values need to be set, and the correct writing method should be concise. 5. The best practice is to keep the code concise and use Boolean properties reasonably to optimize web page performance and user experience.
How can you validate your HTML code?Apr 24, 2025 am 12:04 AMHTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.
HTML vs. CSS and JavaScript: Comparing Web TechnologiesApr 23, 2025 am 12:05 AMHTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.
HTML as a Markup Language: Its Function and PurposeApr 22, 2025 am 12:02 AMThe function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.
The Future of HTML, CSS, and JavaScript: Web Development TrendsApr 19, 2025 am 12:02 AMThe future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.
HTML: The Structure, CSS: The Style, JavaScript: The BehaviorApr 18, 2025 am 12:09 AMThe roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.
The Future of HTML: Evolution and Trends in Web DesignApr 17, 2025 am 12:12 AMThe future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.
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