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如何用CSS实现全大写字母

一、text-transform属性

在CSS中,我们可以使用text-transform属性来实现文本的大小写转换效果。该属性可以取四个值,分别是:

  • none:保持文本大小写不变
  • capitalize:将每个单词的首字母转换为大写
  • uppercase:将文本全部转换为大写字母
  • lowercase:将文本全部转换为小写字母

因此,我们可以通过将text-transform属性设置为uppercase来实现全大写字母的效果。下面是一个示例:

  <style>
    h2 {
      text-transform: uppercase;
    }
  </style>

  <h2>这是一个标题</h2>

上述代码将

标签的文本转换为大写字母了。

二、font-variant属性

另一个实现全大写字母的方法是使用font-variant属性。该属性可以取两个值,分别是normal和small-caps。当该属性设置为small-caps时,文本将显示为小大写字母,其中小写字母的大小为字体大小的一半。因为小写字母显示时是小于大写字母的,所以这样的效果看起来就像是文本全部使用了大写字母。

因此,我们可以通过将font-variant属性设置为small-caps来实现全大写字母的效果。下面是一个示例:

  <style>
    h2 {
      font-variant: small-caps;
    }
  </style>

  <h2>这是一个标题</h2>

上述代码将

标签的文本转换为全大写字母了。

三、::before伪元素

除了使用CSS属性之外,我们还可以使用::before伪元素来实现全大写字母的效果。::before伪元素可以在指定元素的内容之前插入一个元素,因此我们可以通过该元素来显示全大写字母文本。下面是一个示例:

  <style>
    h2::before {
      content: "这是一个标题";
      text-transform: uppercase;
    }
  </style>

  <h2></h2>

上述代码将在

标签之前插入一个全大写字母的文本,因此

标签的内容将被替换为全大写字母文本了。

四、JavaScript实现

除了纯CSS外,我们还可以使用JavaScript来实现全大写字母的效果。下面是一个使用JavaScript实现的示例:

  <script>
    var title = document.getElementsByTagName("h2")[0];
    title.innerHTML = title.innerHTML.toUpperCase();
  </script>

  <h2>这是一个标题</h2>

上述代码将获取页面中的第一个

标签,并将其文本转换为全大写字母了。

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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 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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)