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深入了解CSS属性background-repeat

一、background-repeat属性默认值

在不设置background-repeat属性时,它的默认值为repeat。它表示背景图片将会重复显示,当图片的宽度或高度小于元素的宽度或高度时,背景图片将自动重复显示,覆盖整个元素。

    background-image: url("example.png");
    background-repeat: repeat;

二、background-clip属性

background-clip属性用于指定背景图片的裁剪区域。它的默认值是border-box,表示背景图片会显示到边框边缘为止。如果将其值设置为padding-box,背景图片会显示到内边距边缘。如果将其设置为content-box,则背景图片仅显示在内容区域中。

    background-image: url("example.png");
    background-repeat: repeat;
    background-clip: border-box;

三、background-repeat相关属性

1、background-repeat: no-repeat

当设置background-repeat属性为no-repeat时,背景图片不会自动重复显示,只会显示一次。

    background-image: url("example.png");
    background-repeat: no-repeat;

2、background-repeat: repeat-x

当设置background-repeat属性为repeat-x时,背景图片只在水平方向上自动重复显示,垂直方向上不会重复。

    background-image: url("example.png");
    background-repeat: repeat-x;

3、background-repeat: repeat-y

当设置background-repeat属性为repeat-y时,背景图片只在垂直方向上重复显示,水平方向上不会重复。

    background-image: url("example.png");
    background-repeat: repeat-y;

4、background-repeat: space

当设置background-repeat属性为space时,背景图片将在水平和垂直方向上重复显示。如果元素的大小大于背景图片的大小,将会自动计算图片的间距,使图片在元素中均匀分布。

    background-image: url("example.png");
    background-repeat: space;

5、background-repeat: round

当设置background-repeat属性为round时,背景图片将在水平和垂直方向上重复显示。如果元素的大小大于背景图片的大小,将会自动调整图片的大小和间距,让图片均匀分布并完全填充整个元素。

    background-image: url("example.png");
    background-repeat: round;
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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 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 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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)