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让你的CSS字母大小写变得更妥帖

CSS样式表是前端开发中非常重要的一个部分,而其中字母大小写的问题也是开发者经常会碰到的问题,因为字母的大小写往往会影响页面的输出效果和样式。本文将会从以下几个方面详细阐述如何让你的CSS字母大小写变得更妥帖。

一、CSS字母大小写的基本规则

CSS样式表中字母的大小写是区分的,这也就意味着在给标签添加样式时,大小写的不同会产生不同的效果。比如说,字母“B”和字母“b”在CSS中是不同的,它们在样式表中分别统计在不同的位置,因此写作风格的不同会影响输出效果的不同。

CSS的主要字母大小写规则如下:

选择器名和样式名:区分大小写
属性名:不区分大小写,建议使用小写
属性值:有些值大小写有区别,比如#FF0000和#ff0000是同一个颜色值,但是border不能全部小写,例如:border-top、border-left

二、优化CSS中的字母大小写

在CSS中,大写字母和小写字母的大小会影响代码的排版和可读性,对于开发者来说非常不友好,而且也容易读错和输入错误。所以开发者需要尽可能地减少大小写字母的使用,让代码更易读、易理解,同时也可以提升代码的效率。

在这里,我们给大家推荐使用一种CSS命名规范,叫做“小驼峰命名法”。这种命名法将所有单词的首字母都大写,除了第一个单词以外。这种命名法的好处在于代码会更具有可读性,而且调试代码时也会更加容易。

/*使用小驼峰命名法*/
.boxContainer {
  width: 100%;
  margin: 0 auto;
}
/*不使用小驼峰命名法*/
.box_Container{
  width:100%;
  margin:0 auto;
}

三、使用预处理器来优化CSS字母大小写

在CSS中,使用预处理器可以减少代码中的性能问题和大小写敏感问题。而且,使用CSS预处理器可以使CSS代码可读性更高,更易于管理和维护。

我们推荐使用SASS和LESS预处理器,这两种预处理器都可以提供类CSS的编程语言,可以使用变量、指令、语句等功能,有效地减少了CSS代码的冗余性。SASS和LESS还可以将CSS代码编译成纯CSS,并可以将所有样式放到一个CSS文件中,提高了代码的性能。

/*使用SASS*/
$color-primary: #0084ff;
$breakpoint-sm: 576px;

.mainContainer {
  background-color: $color-primary;
  @media (max-width: $breakpoint-sm) {
    width: 100%;
  }
}

/*使用LESS*/
@color-primary: #0084ff;
@breakpoint-sm: 576px;

.mainContainer {
  background-color: @color-primary;
  @media (max-width: @breakpoint-sm) {
    width: 100%;
  }
}

四、总结

在编写CSS代码时,字母大小写的优化是一个需要注意的问题,因为字母的大小写往往会影响页面的输出效果和样式。在本文中,我们从CSS字母大小写的基本规则、优化CSS中的字母大小写、使用预处理器来优化CSS字母大小写三个方面详细阐述了如何让你的CSS字母大小写变得更妥帖。

/*小驼峰命名法样式*/
.boxContainer {
  width: 100%;
  margin: 0 auto;
}

/*SASS预处理器样式*/
$color-primary: #0084ff;
$breakpoint-sm: 576px;

.mainContainer {
  background-color: $color-primary;
  @media (max-width: $breakpoint-sm) {
    width: 100%;
  }
}

/*LESS预处理器样式*/
@color-primary: #0084ff;
@breakpoint-sm: 576px;

.mainContainer {
  background-color: @color-primary;
  @media (max-width: @breakpoint-sm) {
    width: 100%;
  }
}
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when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: ${item.id} [in template "article/detail/index.ftl" at line 48, column 106] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134) at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:481) at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:401) at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:370) at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:104) at freemarker.core.DollarVariable.accept(DollarVariable.java:63) at freemarker.core.Environment.visit(Environment.java:371) at freemarker.core.IteratorBlock$IterationContext.executedNestedContentForCollOrSeqListing(IteratorBlock.java:321) at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:271) at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:244) at freemarker.core.Environment.visitIteratorBlock(Environment.java:645) at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:108) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94) at freemarker.core.Environment.visit(Environment.java:335) at freemarker.core.Environment.visit(Environment.java:341) at freemarker.core.Environment.visit(Environment.java:341) at freemarker.core.Environment.process(Environment.java:314) at freemarker.template.Template.process(Template.java:383) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:332) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:266) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:220) at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:181) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:314) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1431) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1167) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1106) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at com.software.filter.HttpSpiderIdentifyFilter.doFilter(HttpSpiderIdentifyFilter.java:51) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:340) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) at java.base/java.lang.VirtualThread.run(VirtualThread.java:309)