CSS Common Styles (4) Animation

　　Part 3 Common CSS Styles (3) This blog post has already introduced the transition and transform with animated effects in CSS. Today, let’s talk about animation in CSS. The addition of animation will make the animation effect more optimistic.

　animation

　 The implementation of animation needs to be implemented through keyframes. keyframes (keyframes), similar to keyframes in flash. Keyframes have their own syntax rules. Their naming starts with "@keyframes", followed by the "name of the animation" plus a pair of curly brackets "{}". In the brackets are some style rules for different time periods. , a bit like our css style writing method. For a style rule in "@keyframes" that is composed of multiple percentages, such as between "0%" and "100%", we can create multiple percentages in this rule, and we give each percentage a Elements that need animation effects are added with different attributes, so that the elements can achieve a constantly changing effect, such as moving, changing the element's color, position, size, shape, etc. However, one thing to note is that we can use "fromt" and "to" to represent where an animation starts and ends. In other words, "from" is equivalent to "0%" and "to" is equivalent to "100%", it is worth mentioning that "0%" cannot omit the percent sign like other attribute values. We must add the percent sign ("%") here. If not, we This keyframes is invalid and has no effect. Because the unit of keyframes only accepts percentage values.

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　ics

Kernel typeWebkit(Chrome/Safari)Gecko(Firefox)Presto(Opera)Trident(IE)W3C

　

　Attribute description:

　1. animation-name: Retrieve or set the animation name applied to the object. It must be used in conjunction with the rule @keyframes. The animation name can be chosen freely, and the semantics will be better

　2. animation-duration: Retrieve or set the duration of object animation

　3. animation-timing-function: Retrieve or set the transition type of object animation

Value:

　linear: linear transition. Equivalent to Bezier curve (0.0, 0.0, 1.0, 1.0)

　ease: smooth transition. Equivalent to Bezier curve (0.25, 0.1, 0.25, 1.0)

　ease-in: from slow to fast. Equivalent to Bezier curve (0.42, 0, 1.0, 1.0)

　ease-out: from fast to slow. Equivalent to Bezier curve (0, 0, 0.58, 1.0)

　ease-in-out: from slow to fast to slow again. Equivalent to Bezier curve (0.42, 0, 0.58, 1.0)

　cubic-bezier(, , , ): A specific Bezier curve type, the 4 values ​​​​must be within the interval [0, 1]

　4. animation-iteration-count: Retrieve or set the number of cycles of object animation

　 Value:

　 infinite: infinite loop

　　number: The specific number of cycles of the specified object animation

　5. animation-direction: Retrieve or set whether the object animation moves in reverse in the loop

　 Value:

　Normal: normal direction

　 Alternate: normal and reverse alternating

　6. animation-play-state: Retrieve or set the state of object animation

　running：Sports

　paused: pause

　7. animation-fill-mode: Retrieve or set the state of the object outside of the animation time

　 Value:

　 none: Default value. Do not set the state other than object animation

　 forwards: Set the object state to the state at the end of the animation

　backwards: Set the object state to the state when the animation starts

　Both: Set the object status to the end or start state of the animation

　The following is an example for comprehensive explanation:

　 CSS code:

<span style="font-family: 'Microsoft YaHei'; font-size: 15px;"><span style="color: #800000;">    #animation
            </span>{<span style="color: #ff0000;">
                width</span>:<span style="color: #0000ff;"> 250px</span>;<span style="color: #ff0000;">
                height</span>:<span style="color: #0000ff;"> 250px</span>;<span style="color: #ff0000;">
                background-color</span>:<span style="color: #0000ff;"> brown</span>;<span style="color: #ff0000;">
                opacity</span>:<span style="color: #0000ff;"> 0.5</span>;<span style="color: #ff0000;">
                position</span>:<span style="color: #0000ff;">absolute</span>;<span style="color: #ff0000;">                
                left</span>:<span style="color: #0000ff;">40%</span>;<span style="color: #ff0000;">
                overflow</span>:<span style="color: #0000ff;"> hidden</span>;
                
            }<span style="color: #800000;">
            #animation span
            </span>{<span style="color: #ff0000;">
                font-family</span>:<span style="color: #0000ff;"> "微软雅黑"</span>;<span style="color: #ff0000;">
                font-size</span>:<span style="color: #0000ff;"> 20px</span>;<span style="color: #ff0000;">
                color</span>:<span style="color: #0000ff;"> #ccc</span>;<span style="color: #ff0000;">
                opacity</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;">
                display</span>:<span style="color: #0000ff;"> block</span>;<span style="color: #ff0000;">
                margin</span>:<span style="color: #0000ff;"> 30px</span>;
                
            }<span style="color: #800000;">
            #text1:hover
            </span>{<span style="color: #ff0000;">
                -moz-animation-play-state</span>:<span style="color: #0000ff;">paused</span>;/*鼠标经过时暂停动画*/<span style="color: #ff0000;">
                -webkit-animation-play-state</span>:<span style="color: #0000ff;">paused</span>;<span style="color: #ff0000;">
                -o-animation-play-state</span>:<span style="color: #0000ff;">paused</span>;<span style="color: #ff0000;">
                -ms-animation-play-state</span>:<span style="color: #0000ff;">paused</span>;<span style="color: #ff0000;">
                animation-play-state</span>:<span style="color: #0000ff;">paused</span>;

            }<span style="color: #800000;">
            #text2:hover
            </span>{<span style="color: #ff0000;">
                -moz-animation-play-state</span>:<span style="color: #0000ff;">paused</span>;<span style="color: #ff0000;">
                -webkit-animation-play-state</span>:<span style="color: #0000ff;">paused</span>;<span style="color: #ff0000;">
                -o-animation-play-state</span>:<span style="color: #0000ff;">paused</span>;<span style="color: #ff0000;">
                -ms-animation-play-state</span>:<span style="color: #0000ff;">paused</span>;<span style="color: #ff0000;">
                animation-play-state</span>:<span style="color: #0000ff;">paused</span>;

            }<span style="color: #800000;">
            #text1
            </span>{<span style="color: #ff0000;">
                
                -webkit-animation-name</span>:<span style="color: #0000ff;">animation1</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">动画名称</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-animation-duration</span>:<span style="color: #0000ff;">4s</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">动画持续时间</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-animation-timing-function</span>:<span style="color: #0000ff;">ease-in</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">变化由慢到快</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-animation-delay</span>:<span style="color: #0000ff;"> 2s</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">过了2S后开始动画</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-animation-iteration-count</span>:<span style="color: #0000ff;"> infinite</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">设置动画无限播放</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-transform</span>:<span style="color: #0000ff;"> translate(55px)</span>;<span style="color: #ff0000;">
                
                animation-name</span>:<span style="color: #0000ff;">animation1</span>;<span style="color: #ff0000;">
                animation-delay</span>:<span style="color: #0000ff;"> 4s</span>;<span style="color: #ff0000;">
                animation-timing-function</span>:<span style="color: #0000ff;"> ease-in</span>;<span style="color: #ff0000;">
                animation-delay</span>:<span style="color: #0000ff;"> 2s</span>;<span style="color: #ff0000;">
                animation-iteration-count</span>:<span style="color: #0000ff;"> infinite</span>;<span style="color: #ff0000;">
                transform</span>:<span style="color: #0000ff;"> translate(55px)</span>;<span style="color: #ff0000;">
                
                -ms-animation-name</span>:<span style="color: #0000ff;">animation1</span>;<span style="color: #ff0000;">
                -ms-animation-duration</span>:<span style="color: #0000ff;">4s </span>;<span style="color: #ff0000;">
                -ms-animation-timing-function</span>:<span style="color: #0000ff;"> ease-in</span>;<span style="color: #ff0000;">
                -ms-animation-delay</span>:<span style="color: #0000ff;"> 2s</span>;<span style="color: #ff0000;">
                -ms-animation-iteration-count</span>:<span style="color: #0000ff;"> infinite</span>;<span style="color: #ff0000;">
                -ms-transform</span>:<span style="color: #0000ff;"> translate(55px)</span>;<span style="color: #ff0000;">
                
                -moz-animation-name</span>:<span style="color: #0000ff;">animation1</span>;<span style="color: #ff0000;">
                -moz-animation-delay</span>:<span style="color: #0000ff;">4s </span>;<span style="color: #ff0000;">
                -moz-animation-timing-function</span>:<span style="color: #0000ff;"> ease-in</span>;<span style="color: #ff0000;">
                -moz-animation-delay</span>:<span style="color: #0000ff;"> 2s</span>;<span style="color: #ff0000;">
                -moz-animation-iteration-count</span>:<span style="color: #0000ff;"> infinite</span>;<span style="color: #ff0000;">    
                -moz-transform</span>:<span style="color: #0000ff;"> translate(55px)</span>;
            }<span style="color: #800000;">
            #text2
            </span>{<span style="color: #ff0000;">
                -webkit-animation-name</span>:<span style="color: #0000ff;">animation2</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">动画名称</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-animation-duration</span>:<span style="color: #0000ff;">4s</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">动画持续时间</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-animation-timing-function</span>:<span style="color: #0000ff;">ease-in</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">变化由慢到快</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-animation-delay</span>:<span style="color: #0000ff;"> 2s</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">过了2S后开始动画</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-animation-iteration-count</span>:<span style="color: #0000ff;"> infinite</span>;<span style="color: #008000;">/*</span><span style="color: #008000;">设置动画无限播放</span><span style="color: #008000;">*/</span><span style="color: #ff0000;">
                -webkit-transform</span>:<span style="color: #0000ff;"> translate(60px)</span>;<span style="color: #ff0000;">
                
                animation-name</span>:<span style="color: #0000ff;">animation2</span>;<span style="color: #ff0000;">
                animation-delay</span>:<span style="color: #0000ff;"> 4s</span>;<span style="color: #ff0000;">
                animation-timing-function</span>:<span style="color: #0000ff;"> ease-in</span>;<span style="color: #ff0000;">
                animation-delay</span>:<span style="color: #0000ff;"> 2s</span>;<span style="color: #ff0000;">
                animation-iteration-count</span>:<span style="color: #0000ff;"> infinite</span>;<span style="color: #ff0000;">
                transform</span>:<span style="color: #0000ff;"> translate(60px)</span>;<span style="color: #ff0000;">
                
                -ms-animation-name</span>:<span style="color: #0000ff;">animation2</span>;<span style="color: #ff0000;">
                -ms-animation-duration</span>:<span style="color: #0000ff;">4s </span>;<span style="color: #ff0000;">
                -ms-animation-timing-function</span>:<span style="color: #0000ff;"> ease-in</span>;<span style="color: #ff0000;">
                -ms-animation-delay</span>:<span style="color: #0000ff;"> 2s</span>;<span style="color: #ff0000;">
                -ms-animation-iteration-count</span>:<span style="color: #0000ff;"> infinite</span>;<span style="color: #ff0000;">
                -ms-transform</span>:<span style="color: #0000ff;"> translate(60px)</span>;<span style="color: #ff0000;">
                
                -moz-animation-name</span>:<span style="color: #0000ff;">animation2</span>;<span style="color: #ff0000;">
                -moz-animation-delay</span>:<span style="color: #0000ff;">4s </span>;<span style="color: #ff0000;">
                -moz-animation-timing-function</span>:<span style="color: #0000ff;"> ease-in</span>;<span style="color: #ff0000;">
                -moz-animation-delay</span>:<span style="color: #0000ff;"> 2s</span>;<span style="color: #ff0000;">
                -moz-animation-iteration-count</span>:<span style="color: #0000ff;"> infinite</span>;<span style="color: #ff0000;">    
                -moz-transform</span>:<span style="color: #0000ff;"> translate(60px)</span>;        
                    
            }<span style="color: #800000;">
            @-webkit-keyframes animation1
            </span>{<span style="color: #ff0000;">
                0%{-webkit-transform</span>:<span style="color: #0000ff;"> translate(-10px)</span>;<span style="color: #ff0000;">opacity</span>:<span style="color: #0000ff;"> 0</span>;}<span style="color: #800000;">
                20%</span>{<span style="color: #ff0000;">-webkit-transform</span>:<span style="color: #0000ff;"> translate(25px)</span>;<span style="color: #ff0000;">opacity</span>:<span style="color: #0000ff;"> 0.5</span>;}<span style="color: #800000;">
                45%</span>{<span style="color: #ff0000;">-webkit-transform</span>:<span style="color: #0000ff;"> translate(45px)</span>;<span style="color: #ff0000;">opacity</span>:<span style="color: #0000ff;"> 1</span>;}<span style="color: #800000;">
                100%</span>{<span style="color: #ff0000;">-webkit-transform</span>:<span style="color: #0000ff;"> translate(60px)</span>;<span style="color: #ff0000;">opacity</span>:<span style="color: #0000ff;"> 0.8</span>;}<span style="color: #800000;">
                
            }
            @-webkit-keyframes animation2
            </span>{<span style="color: #ff0000;">
                0%{-webkit-transform</span>:<span style="color: #0000ff;"> translate(280px)</span>;<span style="color: #ff0000;">opacity</span>:<span style="color: #0000ff;"> 0</span>;}<span style="color: #800000;">
                30%</span>{<span style="color: #ff0000;">-webkit-transform</span>:<span style="color: #0000ff;"> translate(200px)</span>;<span style="color: #ff0000;">opacity</span>:<span style="color: #0000ff;"> 0.5</span>;}<span style="color: #800000;">
                65%</span>{<span style="color: #ff0000;">-webkit-transform</span>:<span style="color: #0000ff;"> translate(130px)</span>;<span style="color: #ff0000;">opacity</span>:<span style="color: #0000ff;"> 1</span>;}<span style="color: #800000;">                
                100%</span>{<span style="color: #ff0000;">-webkit-transform</span>:<span style="color: #0000ff;"> translate(60px)</span>;<span style="color: #ff0000;">opacity</span>:<span style="color: #0000ff;">0.8</span>;}<span style="color: #800000;">
            }</span></span>

　　HTML代码：　

<span style="font-family: 'Microsoft YaHei'; font-size: 16px;"><span style="color: #000000;"><div id="animation">
    </span><span style="color: #0000ff;"><</span><span style="color: #800000;">span </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="text1"</span><span style="color: #0000ff;">></span>这是ly婠婠的博客<span style="color: #0000ff;"></</span><span style="color: #800000;">span</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><</span><span style="color: #800000;">span </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="text2"</span><span style="color: #0000ff;">></span>欢迎访问和评论！<span style="color: #0000ff;"></</span><span style="color: #800000;">span</span><span style="color: #0000ff;">></span>            
<span style="color: #0000ff;"></</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span></span>

效果如下：

解析说明：

在这个例子中，效果如上图。这里主要是利用animation和translate来达到一个文字渐进的效果。translate的作用是让文字根据给定值发生平移。animation则利用关键帧和百分比数值来将平移过程细分成几个帧，然后设置持续时间，一帧帧连接起来形成动画。

Writing
-webkit-animation
-moz-animation
-ms-animation
animation