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使用CSS创建漂亮的渐变PDF背景

一、CSS渐变背景的优点

在设计网页和美化样式时,CSS渐变背景是一种非常强大的工具。相比于直接使用图片,CSS渐变背景有以下几个优点:

1、节省页面加载时间:使用CSS渐变背景不需要向服务器发送请求获取图片资源,可以大大降低页面加载时间。

2、适应性强:使用CSS渐变背景可以自由调整大小和颜色等属性,适应不同分辨率和设备的屏幕。

3、易于修改:如果需要修改背景颜色或添加新的渐变效果,直接修改CSS样式即可,不需要重新设计和编辑图片。

二、CSS渐变背景的基本语法

background: linear-gradient(direction, color-stop1, color-stop2, ...);

其中,linear-gradient为渐变颜色函数;direction为渐变方向参数,可选项有to top、to bottom、to left、to right,也可以自定义方向,如45deg;color-stop为渐变的颜色停靠点,可以设置为长度、百分比或关键字。多个颜色停靠点之间用逗号隔开。

三、使用CSS渐变背景实现PDF背景

在PDF阅读器中,背景颜色默认为白色,但我们可以使用CSS渐变背景实现PDF背景的美化。

下面是一个实例代码:

body {
  background: linear-gradient(to bottom, #f2f2f2, #dcdcdc, #f2f2f2);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

该代码实现了从#f2f2f2到#dcdcdc再到#f2f2f2的渐变背景,并将背景不重复地铺满整个页面,滚动页面时背景不会跟着滚动而变化。

四、CSS渐变背景的常用属性

CSS渐变背景支持多种属性,以下是一些常用属性:

1、linear-gradient:线性渐变颜色,可以设置渐变方向和渐变色停靠点。

2、radial-gradient:径向渐变颜色,可以从中心向外扩散渐变。

3、background-size:控制背景图片的大小。可以设置为auto(自适应),cover(铺满整个容器),contain(适应容器大小,不超出)等。

4、background-repeat:控制背景图片的重复方式。可以设置为repeat(平铺),repeat-x(水平重复),repeat-y(竖直重复),no-repeat(不重复)。

5、background-attachment:控制背景图片的滚动方式。可以设置为scroll(跟随滚动),fixed(固定不动)。

五、结语

使用CSS渐变背景可以让页面变得更美观,同时也能够提升页面性能和可维护性。希望本文能够对大家有所帮助,如果有任何问题或建议,欢迎在评论区留言。

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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 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)