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如何用CSS实现加号样式

一、基础CSS样式

首先我们来看一下如何基于基础的CSS样式实现加号样式。

/*HTML*/
<div class="plus">加号</div>

/*CSS*/
.plus {
  border: 1px solid #ddd;
  display: inline-block;
  padding: 5px;
}

.plus::before {
  content: "+";
  margin-right: 5px;
}

这段代码中,我们使用了伪元素::before,给加号添加了一个before伪元素,并设置了content属性,将加号添加到before伪元素中。我们使用margin-right属性,为content和加号之间添加了5px的距离。

二、CSS动画

如果我们想要让加号在hover时出现动态特效,可以使用CSS动画来实现。

/*HTML*/
<div class="plus2">加号</div>

/*CSS*/
.plus2 {
  border: 1px solid #ddd;
  display: inline-block;
  padding: 5px;
}

.plus2::before {
  content: "+";
  margin-right: 5px;
  transition: all 0.2s ease-in-out;
}

.plus2:hover::before {
  transform: rotate(45deg) scale(1.5);
}

这段代码中,我们给before伪元素添加了transition属性,实现了在hover时平滑过渡的效果。我们使用:hover伪类,控制加号的旋转和伸缩效果,并使用transform属性,实现了这些效果。

三、利用多个元素实现更复杂的加号

我们也可以使用多个元素来实现更复杂的加号样式,下面看一个例子。

/*HTML*/
<div class="plus3">
  <div class="plus3__left"></div>
  <div class="plus3__right"></div>
  <div class="plus3__top"></div>
  <div class="plus3__bottom"></div>
</div>

/*CSS*/
.plus3 {
  border: 1px solid #ddd;
  display: inline-block;
  padding: 5px;
  position: relative;
}

.plus3__left,
.plus3__right,
.plus3__top,
.plus3__bottom {
  background-color: #000;
  height: 1px;
  position: absolute;
  width: 40%;
}

.plus3__left {
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}

.plus3__right {
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.plus3__top {
  left: 50%;
  top: 0;
  transform: translateX(-50%);
}

.plus3__bottom {
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
}

这段代码中,我们使用了四个div元素,分别代表加号的上下左右四个部分。我们将四个元素定位为绝对定位,并使用transform属性,使它们水平和垂直居中对齐。

四、实现动态的加号

最后,我们来看一个实现动态加号的例子。

/*HTML*/
<div class="plus4"></div>

/*CSS*/
.plus4 {
  background-color: #000;
  height: 1px;
  width: 40%;
  position: relative;
}

.plus4::before,
.plus4::after {
  background-color: #000;
  content: "";
  height: 1px;
  position: absolute;
  width: 40%;
  top: 50%;
}

.plus4::before {
  left: 0;
  transform: translateY(-50%) rotate(45deg);
}

.plus4::after {
  right: 0;
  transform: translateY(-50%) rotate(-45deg);
}

.plus4:hover::before,
.plus4:hover::after {
  width: 60%;
}

这段代码中,我们使用了:hover伪类,控制加号的动态效果。我们使用before和after伪元素,分别代表加号的左上和右下两个部分。我们将before伪元素旋转45度,并将after伪元素旋转-45度,使它们组成加号的样式。我们使用:hover伪类,为before和after伪元素添加了60%的长度,实现了加号伸展的效果。

如何用CSS实现加号样式

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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)