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CSS中的字体粗细属性 - font-weight

一、什么是字体粗细属性?

CSS中的字体粗细属性是指控制字体是否加粗的属性,可以通过属性值控制字体的粗细程度。字体粗细属性的属性值为数字或关键字。

数字表示字体的粗细程度,取值范围从100到900,对应的粗细程度从“普通”到“黑”。关键字表示字体的相对粗细程度,包括以下几种:

  • normal:普通字体(相当于数字400)
  • bold:加粗字体(相当于数字700)
  • bolder:更加加粗的字体(比bold更加粗,根据字体家族不同,实际效果可能不明显)
  • lighter:更加细的字体(比normal更细,根据字体家族不同,实际效果可能不明显)

二、字体粗细属性的使用

字体粗细属性可以用于控制文本的样式,实现不同的视觉效果。比如:

  • 在标题中使用加粗字体,可以提高标题的可读性,让标题更加突出。
  • 在导航栏中使用加粗字体,可以让用户更容易区分导航链接和普通文本。
  • 在重要内容中使用更加加粗的字体,可以让重要内容更加突出。
  • 在注释中使用更加细的字体,可以让注释更加轻巧,避免干扰用户的视线。

使用字体粗细属性可以达到不同的视觉效果,提高文本的可读性和用户体验。

三、字体粗细属性的注意事项

在使用字体粗细属性时,需要注意以下几点:

  • 字体家族不同,对应的数字和关键字的实际效果可能不同,需要根据实际情况选择。
  • 过度使用字体粗细属性会降低文本的可读性,影响用户体验。
  • 在使用字体粗细属性时,需要考虑字体大小和行距,以保持文本的整齐美观。

四、代码示例

下面是一个简单的代码示例,展示了如何使用字体粗细属性:

  <!-- 使用数字表示粗细程度 -->
  <p style="font-weight: 100;">普通字体</p>
  <p style="font-weight: 400;">普通字体</p>
  <p style="font-weight: 700;">加粗字体</p>
  <p style="font-weight: 900;">黑字体</p>

  <!-- 使用关键字表示粗细程度 -->
  <p style="font-weight: normal;">普通字体</p>
  <p style="font-weight: bold;">加粗字体</p>
  <p style="font-weight: bolder;">更加加粗的字体</p>
  <p style="font-weight: lighter;">更加细的字体</p>

五、总结

字体粗细属性是CSS中常用的样式属性之一,可以通过控制字体的粗细程度实现不同的视觉效果。在使用字体粗细属性时,需要注意字体大小、行距和字体家族的实际效果,避免过度使用导致文本可读性下降。

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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: [... 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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.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)