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如何优雅地处理文本大写?

一、CSS处理文本大写

CSS提供了text-transform属性,可以将文本转换成大写、小写、首字母大写等形式。

.uppercase {
  text-transform: uppercase;
}

.lowercase {
  text-transform: lowercase;
}

.capitalize {
  text-transform: capitalize;
}

使用示例:

<p class="uppercase">HELLO WORLD</p> // 输出为:HELLO WORLD
<p class="lowercase">hello world</p> // 输出为:hello world
<p class="capitalize">hello world</p> // 输出为:Hello World

二、JavaScript处理文本大写

JavaScript提供了字符串的toUpperCase()和toLowerCase()方法,可以将字符串转换成大写或小写形式。

var str = "hello world";
console.log(str.toUpperCase()); // 输出为:HELLO WORLD
console.log(str.toLowerCase()); // 输出为:hello world

如果要将字符串的首字母大写,可以使用以下方法:

function capitalize(str) {
  return str.charAt(0).toUpperCase() + str.slice(1);
}

console.log(capitalize("hello world")); // 输出为:Hello world

三、Vue.js处理文本大写

在Vue.js中,可以使用过滤器来处理文本的大小写。

<div id="app">
  <p>{{ message | uppercase }}</p>
  <p>{{ message | lowercase }}</p>
  <p>{{ message | capitalize }}</p>
</div>

var app = new Vue({
  el: '#app',
  data: {
    message: 'hello world'
  },
  filters: {
    uppercase: function(value) {
      return value.toUpperCase();
    },
    lowercase: function(value) {
      return value.toLowerCase();
    },
    capitalize: function(value) {
      return value.charAt(0).toUpperCase() + value.slice(1);
    }
  }
});

输出结果:

<p>HELLO WORLD</p>
<p>hello world</p>
<p>Hello world</p>

四、React处理文本大写

在React中,可以使用JavaScript的字符串处理方式来操作文本的大小写。

class App extends React.Component {
  render() {
    return (
      <div>
        <p>{this.props.message.toUpperCase()}</p>
        <p>{this.props.message.toLowerCase()}</p>
        <p>{this.props.message.charAt(0).toUpperCase() + this.props.message.slice(1)}</p>
      </div>
    );
  }
}

ReactDOM.render(<App message="hello world" />, document.getElementById('root'));

输出结果:

<p>HELLO WORLD</p>
<p>hello world</p>
<p>Hello world</p>
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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: ${item.id} [in template "article/detail/index.ftl" at line 48, column 106] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [... 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org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:340) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) at org.apache.coyote.AbstractProtocol$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)