--- title: Flex 布局 description: type: 0 group: ⚙ 组件 menuName: Flex 布局 icon: order: 47 --- Flex 布局是基于 CSS Flex 实现的布局效果，它比 Grid 和 HBox 对子节点位置的可控性更强，比用 CSS 类的方式更易用，并且默认使用水平垂直居中的对齐。 ## 基本用法 ```schema: scope="body" { "type": "flex", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 50, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 50, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 50, "margin": 5 }, "type": "tpl", "tpl": "" }] } ``` 其中 `items` 里的每一个都可以是其他 amis 类型。 ## 子节点水平分布 > 严格来说并不一定是水平，因为还能通过 direction 修改方向，不过这里为了简化就这么称呼了 可以通过 justify 控制水平分布方式，默认是 `center` 居中，其他几种的示例如下： ```schema { "type": "page", "body": [ "center", { "type": "flex", "justify": "center", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] }, "flex-start", { "type": "flex", "justify": "flex-start", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] }, "flex-end", { "type": "flex", "justify": "flex-end", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] }, "space-around", { "type": "flex", "justify": "space-around", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "width": 100, "height": 30, "style": { "backgroundColor": "#46C93A", "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] }, "space-between", { "type": "flex", "justify": "space-between", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] }, "space-evenly", { "type": "flex", "justify": "space-evenly", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] } ] } ``` ## 垂直方向位置 可以通过设置 `alignItems` 改变在子节点在垂直方向的位置，默认是 `center` 居中，其他几个常见设置请参考： ```schema: scope="body" { "type": "page", "body": [ "center", { "type": "flex", "alignItems": "center", "style": { "height": 60, "backgroundColor": "#fff" }, "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] }, { "type": "divider" }, "flex-start", { "type": "flex", "alignItems": "flex-start", "style": { "height": 60, "backgroundColor": "#fff" }, "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] }, { "type": "divider" }, "flex-end", { "type": "flex", "alignItems": "flex-end", "style": { "height": 60, "backgroundColor": "#fff" }, "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] } ] } ``` ## 布局方向 默认是行的方式，可以通过 "direction": "column" 改成列的方式。 ```schema: scope="body" { "type": "page", "body": [ "direction: row", { "type": "flex", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] }, "direction: column", { "type": "flex", "direction": "column", "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 30, "margin": 5 }, "type": "tpl", "tpl": "" }] } ] } ``` ## 移动端支持 有时候希望在移动端有不同展现，比如将 `direction` 改成 `column`： ```schema: scope="body" { "type": "flex", "mobile": { "direction": "column" }, "items": [{ "style": { "backgroundColor": "#1A5CFF", "width": 100, "height": 50, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#46C93A", "width": 100, "height": 50, "margin": 5 }, "type": "tpl", "tpl": "" }, { "style": { "backgroundColor": "#FF4757", "width": 100, "height": 50, "margin": 5 }, "type": "tpl", "tpl": "" }] } ``` 其他关于移动端定制的细节请参考[这里](../docs/extend/mobile)。 ## 属性表 | 属性名 | 类型 | 默认值 | 说明 | | ---------- | -------------------------------------- | ------ | --------------------------------------------------------------------------------------------------- | | type | `string` | `flex` | 指定为 Flex 渲染器 | | className | `string` | | css 类名 | | justify | `string` | | "start", "flex-start", "center", "end", "flex-end", "space-around", "space-between", "space-evenly" | | alignItems | `string` | | "stretch", "start", "flex-start", "flex-end", "end", "center", "baseline" | | style | `object` | | 自定义样式 | | items[] | [SchemaNode](../docs/types/schemanode) | |