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CSS实现左右移动

一、实现左右移动的机构

在实现左右移动前,我们需要了解移动的机构。CSS中实现元素移动最普遍的方式是使用transform属性和transition属性,同时结合JavaScript实现动态修改元素的样式属性,让元素移动。transform属性可以用来对元素进行平移、旋转、缩放、倾斜等操作,而transition属性可以用来设置元素在某些时间段内,并以某种方式过渡的效果。

二、编程如何实现左右移动

下面我们以示例代码为例,来详细了解如何实现左右移动:

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>CSS实现左右移动</title>
        <style>
            .wrapper {
                width: 500px;
                height: 300px;
                margin: 50px auto;
                position: relative;
            }
            .box {
                width: 100px;
                height: 100px;
                background-color: red;
                position: absolute;
                left: 0;
                top: 50%;
                transform: translateY(-50%);
                transition: all 0.5s ease-out;
            }
            .move {
                left: 400px;
            }
        </style>
    </head>
    <body>
        <div class="wrapper">
            <div class="box"></div>
        </div>
        <script>
            var box = document.querySelector('.box');
            setTimeout(function() {
                box.classList.add('move');
            }, 1000);
        </script>
    </body>
    </html>

以上代码中,我们通过设置CSS属性,将box元素设置为绝对定位,然后在父元素(wrapper)中居中显示。接着,通过设置transform和transition属性,实现平移过渡的效果。其中,transition属性设置了时间、过渡方式以及结束效果,transform属性主要用来实现元素的平移。

对于JavaScript的代码部分,我们只需要获取到需要移动的元素box,然后通过setTimeout方法和添加类名来让元素产生左右移动的效果。其中,setTimeout方法用来延时执行函数,使得元素不是一开始就直接产生平移效果。

三、实现让label左右移动

下面我们以一段代码为例,来详细讲解如何让label标签左右移动:

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>CSS实现左右移动</title>
        <style>
            .wrapper {
                position: relative;
                margin: 50px auto;
                padding: 20px;
                width: 300px;
                background-color: #eee;
            }
            input[type="checkbox"] {
                display: none;
            }
            label {
                position: relative;
                display: inline-block;
                padding: 5px 10px;
                cursor: pointer;
                transition: all 0.3s ease-in-out;
            }
            .circle {
                position: absolute;
                top: 0;
                left: 0;
                width: 20px;
                height: 20px;
                background-color: #fff;
                border: 2px solid #333;
                border-radius: 50%;
                transition: all 0.3s ease-in-out;
            }
            input[type="checkbox"]:checked + label .circle {
                left: 50px;
            }
        </style>
    </head>
    <body>
        <div class="wrapper">
            <input type="checkbox" name="toggle" id="toggle">
            <label for="toggle">
                <div class="circle"></div>
                Toggle
            </label>
        </div>
    </body>
    </html>

在上面的代码中,我们设置了一个toggle开关按钮,让其可以使得label标签左右移动,在选中状态下,label标签会向右平移50px。核心代码在样式表中,使用伪类选择器:checked获取到当前开关的选中状态,然后通过设置.circle的left属性来实现label标签平移的效果。

在实现这个效果的过程中,我们对CSS中的伪类选择器有了更深入的了解,也掌握了如何改变元素的样式属性,从而实现元素的平移效果。

四、机械实现左右上下移动

在实际的生产环境中,我们也可以利用机械设备来实现元素的移动。例如使用齿轮和滑轨来实现元素的左右上下移动。以下代码使用原生JavaScript实现,用到了CSS动画效果和setTimeout方法。

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>CSS实现左右移动</title>
        <style>
            .container {
                position: relative;
                margin: 50px auto;
                width: 300px;
                height: 300px;
            }
            .box {
                position: absolute;
                width: 50px;
                height: 50px;
                background-color: blue;
                left: 0;
                top: 0;
                animation: move 2s ease-in alternate infinite;
            }
            @keyframes move {
                0% {
                    left: 0;
                    top: 0;
                }
                25% {
                    left: 250px;
                }
                50% {
                    top: 250px;
                }
                75% {
                    left: 0;
                }
            }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="box"></div>
        </div>
        <script>
            var box = document.querySelector('.box');
            setTimeout(function() {
                box.style.animationPlayState = 'paused';
            }, 10000);
        </script>
    </body>
    </html>

在上面的代码中,我们定义了一个container容器,在容器中定义一个box元素,该元素使用CSS动画实现左右上下转换移动的效果。其中,动画通过@keyframes来定义,通过使用animation来实现动画效果。同时,我们在JavaScript的代码中使用setTimeout方法,让元素停止移动。

通过这个例子,我们可以动手实践了解如何通过JavaScript和机械的方式来实现元素的左右上下移动,达到一定的制作效果,同时也学会了结合CSS3中的动画属性来实现左右移动的效果 。

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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 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)