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+# animation 基本使用
+
+## 基本属性
+
+```css
+@keyframes fade-in { /* 关键帧名字 */
+	from { /* 等效于 0% */
+		background-color: red;
+	}
+	50% {
+		background-color: orange;
+	}
+	to { /* 等效于 */
+		background-color: yellow;
+	}
+}
+
+.animation-class {
+	/*<single-animation> = <time>  ||  <timing-function>  ||  <time>  ||  <single-animation-iteration-count>  ||  <single-animation-direction>  ||  <single-animation-fill-mode>  ||  <single-animation-play-state>  ||  [ none |  <keyframes-name>  ]*/
+	animation: 3s ease-out 500ms infinite alternate both running fade-in;
+}
+/* 和上边等效 */
+.animation-class-2 {
+	animation-name: fade-in; /* 关键帧名字 */
+	animation-duration:  3s; /* 动画时长 */
+	animation-timing-function: ease-out; /* 动画的时间函数 */
+	animation-delay:  500ms; /* 动画延迟执行时间 */
+	animation-direction: alternate; /* 动画方向 normal: 0% => 100% */
+	animation-iteration-count: infinite; /* 动画执行次数 */
+	animation-fill-mode: both; /* 执行前后的样式 */
+	animation-play-state: running; /* 控制运行和暂停 */
+}
+```