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如何通过CSS将样式表包含到HTML页面中

一、选取合适的CSS文件

为了将样式表包含到HTML页面中,我们需要选择一个CSS文件,这需要我们根据实际需要进行选择。CSS文件包含了一系列的CSS规则,这些规则定义了文档的样式,如字体大小,颜色、背景色等等,因此我们可以根据实际需求进行选择合适的CSS文件。在CSS中,我们可以通过以下方式定义样式:

选择器 {
    属性: 值;
}

其中,选择器指定了需要应用样式的元素,如标签名、类、ID等;属性则指定了需要修改的属性,如颜色、字体大小等。

二、内部样式表

内部样式表是指样式被定义在文档头部的<style>标签中。这种方式比较适合单个页面样式表较少的情况。这种方式的优势在于样式表与HTML文档在同一个文件内,也就是说,我们只需要维护一个文件即可。

下面是一个内部样式表的例子:

<!DOCTYPE html>
<html>
<head>
    <title>内部样式表</title>
    <style type="text/css">
        h1 {
            color: red;
            text-align: center;
        }
    </style>
</head>
<body>
    <h1>这是一个标题</h1>
</body>
</html>

三、外部样式表

外部样式表是一种将CSS代码放在单独的文件中,通过 <link> 标签与HTML文档关联的方式进行应用的CSS方式。这样的CSS文件通常有较严格的组织结构,可以被多个页面重用,适合于需要应用多套样式或是样式表较多的情况。

下面是一个外部样式表的例子。我们将CSS样式放在一个独立的style.css文件中,并用<link>标签在HTML页面中调用:

index.html文件:

<!DOCTYPE html>
<html>
<head>
    <title>外部样式表</title>
    <link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <h1>这是一个标题</h1>
</body>
</html>

style.css文件:

h1 {
    color: red;
    text-align: center;
}

四、行内样式

行内样式是指将CSS代码直接定义在标签内部的样式,优点是可以针对单独的元素进行特殊的CSS样式定义,缺点是不能重复利用,样式难以维护。

下面是一个行内样式的例子:

<!DOCTYPE html>
<html>
<head>
    <title>行内样式</title>
</head>
<body>
    <h1 style="color: red; text-align: center;">这是一个标题</h1>
</body>
</html>

五、选择合适的样式包含方式

在使用CSS样式表的时候,我们根据实际需求来选择合适的包含方式:内部样式表、外部样式表、行内样式等。一般情况下,我们使用外部样式表是最佳实践,以便于实现样式和结构的分离,方便重复使用和维护,提高效率。

六、结语

通过以上的讲解,我们学习了如何通过CSS将样式表包含到HTML页面中,并掌握了内部样式表、外部样式表、行内样式表的基本使用方法。在实际开发中,我们需要根据实际需求选择合适的样式表包含方式,以便于实现样式和结构的重复使用和维护,提高开发效率。

如何通过CSS将样式表包含到HTML页面中

2023-05-12
使用CSS的方法将样式表导入到HTML页面中

2023-05-12
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 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)