添加构造函数
构造函数在作为 Scope 的 add() 或 addOnce() 方法的回调函数传入后,会立即在 Scope 的上下文中被调用。
Scope 会注册并跟踪所有在构造函数内部声明的动画 (animations)、定时器 (timers)、时间轴 (timelines)、可动画对象 (animatables)、可拖拽对象 (draggables)、滚动监听 (onScrolls),甚至是其他作用域 (scopes)。
// Execute a constructor every time a media query changes
scope.add(constructor);
// Execute a constructor once
scope.addOnce(constructorFunction);
构造函数参数
| 名称 | 类型 |
|---|---|
| self | 当前的 Scope 实例 |
返回值 (可选)
一个清理 Function,在 Scope 被还原或媒体查询发生变化时调用。
添加构造函数代码示例
import { utils, animate, createScope, createDraggable } from 'animejs';
createScope({
mediaQueries: { isSmall: '(max-width: 200px)' },
defaults: { ease: 'linear' },
})
.add(self => {
/* Media queries state are accessible on the matches property */
const { isSmall } = self.matches;
/* The $() utility method is also scoped */
const [ $square ] = utils.$('.square');
if (self.matches.isSmall) {
/* Only animate the square when the iframe is small */
animate($square, {
rotate: 360,
loop: true,
});
} else {
/* Only create the draggable when the iframe is large enough */
$square.classList.add('draggable');
createDraggable($square, {
container: document.body,
});
}
return () => {
/* Removes the class 'draggable' when the scope reverts itself */
$square.classList.remove('draggable');
}
});
<div class="iframe-content resizable">
<div class="large centered row">
<div class="col">
<div class="square"></div>
</div>
</div>
</div>