css3动画

When you specify CSS styles inside the @keyframes rule, the animation will gradually change from the current style to the new style at certain times.

To get an animation to work, you must bind the animation to an element.

The following example binds the "example" animation to the

element. The animation will last for 4 seconds, and it will gradually change the background-color of the
element from "red" to "yellow":

<!DOCTYPE html>
<html>
<head>
<style> 
div {
  width: 100px;
  height: 100px;
  background-color: red;
  animation-name: example;
  animation-duration: 4s;
}

@keyframes example {
  from {background-color: red;}
  to {background-color: yellow;}
}
</style>
</head>
<body>

<h1>CSS Animation</h1>

<div></div>

<p><b>Note:</b> When an animation is finished, it goes back to its original style.</p>

</body>
</html>

The animation-duration property defines how long an animation should take to complete. If the animation-duration property is not specified, no animation will occur, because the default value is 0s (0 seconds).
In the example above we have specified when the style will change by using the keywords "from" and "to" (which represents 0% (start) and 100% (complete)).

It is also possible to use percent. By using percent, you can add as many style changes as you like.

The following example will change the background-color of the

element when the animation is 25% complete, 50% complete, and again when the animation is 100% complete:

<!DOCTYPE html>
<html>
<head>
<style>
div {
  width: 100px;
  height: 100px;
  background-color: red;
  animation-name: example;
  animation-duration: 4s;
}

@keyframes example {
  0%   {background-color: red;}
  25%  {background-color: yellow;}
  50%  {background-color: blue;}
  100% {background-color: green;}
}
</style>
</head>
<body>

<h1>CSS Animation</h1>

<div></div>

<p><b>Note:</b> When an animation is finished, it goes back to its original style.</p>

</body>
</html>

Delay an Animation
The animation-delay property specifies a delay for the start of an animation.

The following example has a 2 seconds delay before starting the animation:

div {
  width: 100px;
  height: 100px;
  position: relative;
  background-color: red;
  animation-name: example;
  animation-duration: 4s;
  animation-delay: 2s;
}

Set How Many Times an Animation Should Run
The animation-iteration-count property specifies the number of times an animation should run.

The following example will run the animation 3 times before it stops:

div {
  width: 100px;
  height: 100px;
  position: relative;
  background-color: red;
  animation-name: example;
  animation-duration: 4s;
  animation-iteration-count: 3;
}

The following example uses the value "infinite" to make the animation continue for ever
animation-iteration-count: infinite;

Run Animation in Reverse Direction or Alternate Cycles
The animation-direction property specifies whether an animation should be played forwards, backwards or in alternate cycles.

The animation-direction property can have the following values:

normal - The animation is played as normal (forwards). This is default
reverse - The animation is played in reverse direction (backwards)
alternate - The animation is played forwards first, then backwards
alternate-reverse - The animation is played backwards first, then forwards
The following example will run the animation in reverse direction (backwards):

<!DOCTYPE html>
<html>
<head>
<style> 
div {
  width: 100px;
  height: 100px;
  background-color: red;
  position: relative;
  animation-name: example;
  animation-duration: 4s;
  animation-direction: reverse;  
}

@keyframes example {
  0%   {background-color:red; left:0px; top:0px;}
  25%  {background-color:yellow; left:200px; top:0px;}
  50%  {background-color:blue; left:200px; top:200px;}
  75%  {background-color:green; left:0px; top:200px;}
  100% {background-color:red; left:0px; top:0px;}
}
</style>
</head>
<body>

<h1>CSS Animation</h1>

<p>The animation-direction property specifies whether an animation should be played forwards, backwards or in alternate cycles. The following example will run the animation in reverse direction (backwards):</p>

<div></div>

</body>
</html>

pecify the Speed Curve of the Animation
The animation-timing-function property specifies the speed curve of the animation.

The animation-timing-function property can have the following values:

ease - Specifies an animation with a slow start, then fast, then end slowly (this is default)
linear - Specifies an animation with the same speed from start to end
ease-in - Specifies an animation with a slow start
ease-out - Specifies an animation with a slow end
ease-in-out - Specifies an animation with a slow start and end
cubic-bezier(n,n,n,n) - Lets you define your own values in a cubic-bezier function
The following example shows some of the different speed curves that can be used:

Specify the fill-mode For an Animation
CSS animations do not affect an element before the first keyframe is played or after the last keyframe is played. The animation-fill-mode property can override this behavior.

The animation-fill-mode property specifies a style for the target element when the animation is not playing (before it starts, after it ends, or both).就是动画播放完毕后样式保持在哪一帧，是第一帧还是最后一帧

The animation-fill-mode property can have the following values:

none - Default value. Animation will not apply any styles to the element before or after it is executing
forwards - The element will retain the style values that is set by the last keyframe (depends on animation-direction and animation-iteration-count)
backwards - The element will get the style values that is set by the first keyframe (depends on animation-direction), and retain this during the animation-delay period
both - The animation will follow the rules for both forwards and backwards, extending the animation properties in both directions
The following example lets the

element retain the style values from the last keyframe when the animation ends:

<!DOCTYPE html>
<html>
<head>
<style> 
div {
  width: 100px;
  height: 100px;
  background: red;
  position: relative;
  animation-name: example;
  animation-duration: 3s;  
  animation-fill-mode: forwards;
}

@keyframes example {
  from {top: 0px;}
  to {top: 200px; background-color: blue;}
}
</style>
</head>
<body>

<h1>CSS Animation</h1>

<p>Let the div element retain the style values set by the last keyframe when the animation ends:</p>

<div></div>

</body>
</html>

Animation Shorthand Property
The example below uses six of the animation properties:

div {
  animation-name: example;
  animation-duration: 5s;
  animation-timing-function: linear;
  animation-delay: 2s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
}
div {
  animation: example 5s linear 2s infinite alternate;
}

@keyframes wangyoudong{
  from{

  }
  to{
      transform:translate(900px);  
  }
}
@keyframes wangyoudong2{
  0%{
      background-color:yellow;
  }  
  100%{
      transform:translate(900px); 
       background-color:blue; 
  }
}
.inner{
  width:100px;
  height:100px;
  background-color:red;
  animation-name:wangyoudong;//动画名
  animation-duration:3s;//动画持续时间
}

animation-timing-function:linear;//动画播放方式
animation-iteration-count:infinite;//重复次数
animation-direction CSS 属性设置动画是应正向播放、反向播放还是在正向和反向之间交替播放
animation-direction: normal;
animation-direction: reverse;
animation-direction: alternate;
animation-direction: alternate-reverse;

animation-fill-mode 设置 CSS 动画在执行之前和之后如何将样式应用于其目标
animation-fill-mode: none;
animation-fill-mode: forwards;
animation-fill-mode: backwards;
animation-fill-mode: both;

animation-play-state CSS 属性设置动画是运行还是暂停。
animation-play-state: running;
animation-play-state: paused;

posted @   zhongta  阅读(3)  评论(0)  编辑  收藏  举报
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