繁體中文当前位置: 首页 > 图文教程 > 网页制作 > CSS样式表 > 英文教程:五种CSS选择器类型
- CSS样式表
- 50个强大璀璨的CSS3/JS技术运用实例
- table建站,XHTML建站和DIV建站的不同
- 根据W3C的CSS3草案翻译的CSS3参考手册
- RoundedCornr:生成圆角图片的好用的简单工具
- CSS教程:彻底了解haslayout
- CSS3的简单又实用的3个属性
- CSS教程:-moz-inline-box和-moz-inline-stack
- css3阴影属性box-shadow注意事项
- css3文本阴影属性text-shadow说明
- CSS3的border-radius(圆角)
- border边框属性在浏览器中的渲染方式
- CSS属性:text-shadow，box-shadow，border-radius
- 再论清除浮动的空DIV方法
- YUI网页布局:自适应宽度的输入框
- 学习web标准:Web标准中的特殊字符
- 优化浏览器渲染：将样式表放在页面顶部
- 优化浏览器渲染：指定图片尺寸
- 优化浏览器渲染：避免CSS expressions
- CSS3 Please:在线生成跨浏览器的CSS3代码
- CSS实例教程:制作漂亮的网页表单
CSS样式表 中的 英文教程:五种CSS选择器类型
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-11 浏览: 139 ::
收藏到网摘: n/a
英文教程:五种CSS选择器类型. CSScommandsareusuallygroupedinthecurlybracestomakeasetofrules.FollowingarethevariouswaysavailabletoattachthesesetofruleswithHTMLcode.
Selector(insimplewords)meanshowyounamethesesetofrules.
1CLASSSelectORS
ClassselectorsisthesimplestformofselectorswhereyouassignyourownmeaningfulnametothesetofCSSrules.Tocreateaclassselectoryousimplyneedtowritenameoftheclassfollowedbyaperiod.
(Aclassnamecannotstartwithanumberorasymbolasitisnotsupportedbyvariousbrowsers.)
Forexample,
p.big{font-weight:bold;font-size:12px;}
.center{text-align:center;}
AndthisHTML:
<pclass="big">Thisparagraphwillberenderedbold.www.ruanchen.com</p>
Youcanapplymorethanoneclasstoagivenelement.
AndthisHTML:
<pclass="centerbig">Thisparagraphwillberenderedbold.</p>
Intheaboveexample.bigand.centerarenameofCSSclassesandtheseclassesareappliedtoPtaginHTML.
IfclassnameisfollowedbyHTMLelementinyourCSScodelikep.biginaboveexampleitmeansthatthisclasswillworkonPtagonly.
OtherwiseyoucanapplytheCSSclassonanyelement.
It’sagoodpracticetoaddHTMLelementbeforeclassnameinCSSifyouarewritingCSSrulesforaparticularelement(ItaddsmoreclaritytoCSScode.
2IDSelectORS
IDselectorsworklikeclassselectors,exceptthattheycanonlybeusedononeelementperpagebecausetheyworkwithIDofthehtmlelement.TheidselectorisdefinedasidoftheHTMLelementfollowedbya#symbol.
Forexample,
p#navigation{width:12em;color:#666;font-weight:bold;}
AndthisHTML:
<pid="navigation">Thisparagraphwillberenderedbold.www.ruanchen.com</p>
AsagoodpracticeIDselectorsmustbeusedifyouarewritingtheCSScodeforasingleHTMLelementonly.IDselectorsarewellsupportedacrossstandards-compliantbrowsers.
3TAGSelectOR
TagselectorisanothersimplemethodofCSSrulesimplementation.YoucanusethisselectortoredefinetherulesforaparticularHTMLelement.
Forexample:
p{color:#999;font-weight:bold;}
IntheaboveexampleCSScodewillbeautomaticallyappliedoneveryptag.
4DESCENDENTSelectORS
Descendentselectorsspecifythatstylesshouldonlybeappliedwhentheelementinquestionisadescendent(forexample,achild,oragrandchild)ofanotherelement.
Forexample,
h3em{color:white;background-color:black;}
AndthisHTML:
<h3>Thisis<em>emphasized</em>www.ruanchen.com</h3>
Intheaboveexampleemisdescendentofh3element.Abovecssrulewillautomaticallybeappliedonallemelementsinsideh3elementintheHTMLcode.Descendentselectorsarewellsupportedacrossstandards-compliantbrowsers.
5GROUPINGSelectORS
Youcanalsospecifythesamesetofrulesformorethanoneselctor,likethis:
p,h1,h2{text-align:left;}
Justplaceacommabetweeneachone.
Youcanevengetmorecomplex,andgroupmultipleclassandidselectors:
p.navigation,h1#title{font-weight:bold;}
评论 (0) All
