CSS animation-direction用法及代码示例

CSS中的animation-direction属性用于定义动画的方向。动画的方向应为向前，向后或交替循环。

用法:

animation-direction:normal|reverse|alternate|alternate-reverse|
initial|inherit;

属性值：下面列出了animation-direction属性：
normal:此动画属性将动画向前播放。它是默认值。

用法：
```
animation-direction:normal; 
```

Example:

<!DOCTYPE html>  
<html>  
    <head>  
        <title> 
            CSS | animation-direction Property 
        </title> 
        <style>  
            body { 
                text-align:center; 
            } 
            h1 { 
                color:green; 
            } 
            h3 {  
                width:100%;  
                animation-name:text;  
                animation-duration:2s;  
                animation-iteration-count:infinite;  
            }  
            #one {  
                animation-direction:normal;  
            }  
            @keyframes text {  
                from {  
                    margin-left:60%;  
                }  
                to {  
                    margin-left:0%;  
                }  
            }  
        </style>  
    </head>  
    <body>  
        <h1>GeeksforGeeks</h1>  
        <h2>animation-direction property</h2>  
        <h3 id="one">This text is normal.</h3>  
    </body>  
</html>

Output:

reverse：此动画属性以相反的方向播放动画。

用法:
```
animation-direction:reverse;
```

例：

<!DOCTYPE html>  
<html>  
    <head>  
        <title> 
            CSS | animation-direction Property 
        </title> 
        <style>  
            body { 
                text-align:center; 
            } 
            h1 { 
                color:green; 
            } 
            h3 {  
                width:100%;  
                animation-name:text;  
                animation-duration:2s;  
                animation-iteration-count:infinite;  
            }  
            #one {  
                animation-direction:reverse;  
            }  
            @keyframes text {  
                from {  
                    margin-left:60%;  
                }  
                to {  
                    margin-left:0%;  
                }  
            }  
        </style>  
    </head>  
    <body>  
        <h1>GeeksforGeeks</h1>  
        <h2>animation-direction property</h2>  
        <h3 id="one">This text is reverse.</h3>  
    </body>  
</html>

输出：

交替：此动画属性先播放动画，然后播放动画。

用法:
```
animation-direction:alternate; 
```

例：

<!DOCTYPE html>  
<html>  
    <head>  
        <title> 
            CSS | animation-direction Property 
        </title> 
        <style>  
            body { 
                text-align:center; 
            } 
            h1 { 
                color:green; 
            } 
            h3 {  
                width:100%;  
                animation-name:text;  
                animation-duration:2s;  
                animation-iteration-count:infinite;  
            }  
            #one {  
                animation-direction:alternate;  
            }  
            @keyframes text {  
                from {  
                    margin-left:60%;  
                }  
                to {  
                    margin-left:0%;  
                }  
            }  
        </style>  
    </head>  
    <body>  
        <h1>GeeksforGeeks</h1>  
        <h2>animation-direction property</h2>  
        <h3 id="one">This text is alternate.</h3>  
    </body>  
</html>

输出：

alternate-reverse：此动画属性首先向后播放动画，然后向前播放。

用法:
```
animation-direction:alternate-reverse;
```

例：

<!DOCTYPE html>  
<html>  
    <head>  
        <title> 
            CSS | animation-direction Property 
        </title> 
        <style>  
            body { 
                text-align:center; 
            } 
            h1 { 
                color:green; 
            } 
            h3 {  
                width:100%;  
                animation-name:text;  
                animation-duration:2s;  
                animation-iteration-count:infinite;  
            }  
            #one {  
                animation-direction:alternate-reverse; 
            }  
            @keyframes text {  
                from {  
                    margin-left:60%;  
                }  
                to {  
                    margin-left:0%;  
                }  
            }  
        </style>  
    </head>  
    <body>  
        <h1>GeeksforGeeks</h1>  
        <h2>animation-direction property</h2>  
        <h3 id="one">This text is alternate-reverse.</h3>  
    </body>  
</html>

输出：

initial：此属性用于将animation属性设置为其默认值。

继承：此属性用于从其父元素继承animation属性。

支持的浏览器：下面列出了animation-direction属性支持的浏览器：

谷歌浏览器43.0
Internet Explorer 10.0
Firefox 16.0
Opera 30.0
Safari 9.0

相关用法

注：本文由纯净天空筛选整理自vt_m大神的英文原创作品 CSS | animation-direction Property。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。