<div class="box"> <div class="w_320" id="myPanel"></div> <div class="w_320" id="myPanel1"></div></div>
.box { padding:50px 0 0 50px; }* { padding:0; margin:0; }.w_320 { width:320px; float:left; margin-right:15px;margin-bottom:15px; }.my-foo-trigger { border-radius:5px; }
Ext.onReady(function(){ //6.5 Ext.util.CSS 更好地操作css //6.5.1 createStyleSheet(String cssText,String id) 自动创建一个样式表供html使用 //cssText : .myClass(color:blue;) id : 将指定创建的css绑定到一个id //6.5.2 getRule() 通过指定的css名称查询css规则 var myPanel = new Ext.Panel({ title : '样式表的创建和获取', width : 320, height : 210, renderTo : 'myPanel', frame : true, html : '<div class="myClass" style="height:160px;padding:5px">我是内容部分</div>', buttons : [{ text : '添加样式', handler : addSs },{ text : '移除样式', handler : reSs } ] }); //创建 Ext.util.CSS.createStyleSheet(".myClass{color:blue}","the"); //获取样式规则 var cssObj = Ext.util.CSS.getRule(".myClass",true); console.info("颜色:"+cssObj.style.color); //6.5.3 swapStyleSheet() 动态改变页面的风格 var themes = [ {'theme':'gray风格','css':'theme-gray/resources/theme-gray-all.css'}, {'theme':'classic风格','css':'theme-classic/resources/theme-classic-all.css'}, {'theme':'crisp风格','css':'theme-crisp/resources/theme-crisp-all.css'}, {'theme':'triton风格','css':'theme-triton/resources/theme-triton-all.css'}, {'theme':'neptune风格','css':'theme-neptune/resources/theme-neptune-all.css'}, {'theme':'aria风格','css':'theme-aria/resources/theme-aria-all.css'} ]; //创建主体数据模型 Ext.define('Theme',{ extend: 'Ext.data.Model', fields : ['theme','css'] }); //创建主体数据源 var themeStore = Ext.create('Ext.data.Store',{ model : 'Theme', data : themes }); var themeChange = Ext.create('Ext.form.ComboBox',{ id : 'themeChange', width : 180, labelWidth : 60, labelSeparator : ': ', fieldLabel : '样式选择', store : themeStore,//数据源 editable : false, triggerAction : 'all',//单击触发会显示全部数据 displayField : 'theme', valueField : 'css', queryMode : 'local',//本地模式 value : 'theme-gray/resources/theme-gray-all.css',//默认风格 listeners : { 'collapse' : function(){ Ext.util.CSS.swapStyleSheet('theme','plugin/ext-6.0.0/build/classic/'+this.getValue()); } } }); //定义panel Ext.create('Ext.form.FormPanel',{ title : 'Ext.form.ComboBox本地数据源示例', renderTo : 'myPanel1', bodyStyle : "padding:5px;", frame : true, height : 210, width : 320, defaults : { labelSeparator : ': ', labelWidth : 70, width : 200, labelAlign : 'left' }, items : themeChange }); //6.5.4 removeStyleSheet() 移除样式规则 //创建样式规则 function addSs(){ Ext.util.CSS.createStyleSheet(".myClass{color:blue}","the"); } //移除样式规则 function reSs(){ Ext.util.CSS.removeStyleSheet("the"); } });

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.

ToinsertanimageintoanHTMLpage,usethetagwithsrcandaltattributes.1)UsealttextforaccessibilityandSEO.2)Implementsrcsetforresponsiveimages.3)Applylazyloadingwithloading="lazy"tooptimizeperformance.4)OptimizeimagesusingtoolslikeImageOptimtoreduc

The core purpose of HTML is to enable the browser to understand and display web content. 1. HTML defines the web page structure and content through tags, such as, to, etc. 2. HTML5 enhances multimedia support and introduces and tags. 3.HTML provides form elements to support user interaction. 4. Optimizing HTML code can improve web page performance, such as reducing HTTP requests and compressing HTML.

HTMLtagsareessentialforwebdevelopmentastheystructureandenhancewebpages.1)Theydefinelayout,semantics,andinteractivity.2)SemantictagsimproveaccessibilityandSEO.3)Properuseoftagscanoptimizeperformanceandensurecross-browsercompatibility.


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