简体中文
flex 属性设置弹性元素如何增大或缩小以适应其弹性容器中可用的空间,是 flex-grow、flex-shrink、flex-basis 的简写。
| Web | Android | iOS | HarmonyOS | HarmonyOS(Vapor) |
|---|---|---|---|---|
| 4.0 | 3.9 | 4.11 | 4.61 | 5.0 |
flex: none | [ <'flex-grow'> <'flex-shrink'>? || <'flex-basis'> ];
| 名称 | 兼容性 | 描述 |
|---|---|---|
| initial | 元素会根据自身宽高设置尺寸。它会缩短自身以适应 flex 容器,但不会伸长并吸收 flex 容器中的额外自由空间来适应 flex 容器。相当于将属性设置为"flex: 0 1 auto"。 | |
| auto | 元素会根据自身的宽度与高度来确定尺寸,但是会伸长并吸收 flex 容器中额外的自由空间,也会缩短自身来适应 flex 容器。这相当于将属性设置为 "flex: 1 1 auto". | |
| none | 元素会根据自身宽高来设置尺寸。它是完全非弹性的:既不会缩短,也不会伸长来适应 flex 容器。相当于将属性设置为"flex: 0 0 auto"。 |
| 平台 | 默认值 |
|---|---|
| uvue | none |
注意:W3C 默认值为:initial
示例为hello uni-app x alpha分支,与最新HBuilderX Alpha版同步。与最新正式版同步的master分支示例另见
示例
<template>
<!-- #ifdef APP -->
<scroll-view style="flex: 1">
<!-- #endif -->
<view class="page" style="flex:1">
<view class="head">
<text class="tip">下面有一个灰色区域,display默认值为flex</text>
<text class="tip">当前display值:{{display}}</text>
</view>
<view class="content" :style="{display:display}">
<text style="background-color: aquamarine;">展示display区域</text>
</view>
<button @tap="switchDisplay" class="uni-common-mb">切换display属性</button>
<view class="uni-common-mt">
<text class="uni-title-text">setProperty 设置与 getPropertyValue 获取 display </text>
</view>
<view class="test-container">
<!-- view 组件测试 -->
<view class="test-item">
<text class="uni-subtitle-text">view 组件</text>
<text class="uni-info">设置值: {{displayProp}}</text>
<text class="uni-info">获取值: {{displayActual}}</text>
<view class="test-box">
<view ref="viewRef" class="common-view test-view" :style="{ display: displayProp }">
<text class="common-text">view</text>
</view>
</view>
</view>
<!-- text 组件测试 -->
<view class="test-item">
<text class="uni-subtitle-text">text 组件</text>
<text class="uni-info">设置值: {{displayProp}}</text>
<text class="uni-info">获取值: {{displayActualText}}</text>
<view class="test-box">
<text ref="textRef" class="common-text test-text" :style="{ display: displayProp }">text</text>
</view>
</view>
<!-- image 组件测试 -->
<view class="test-item">
<text class="uni-subtitle-text">image 组件</text>
<text class="uni-info">设置值: {{displayProp}}</text>
<text class="uni-info">获取值: {{displayActualImage}}</text>
<view class="test-box">
<image ref="imageRef" class="common-image test-image" :style="{ display: displayProp }" src="/static/test-image/logo.png"></image>
</view>
</view>
</view>
<!-- 测试控制区域 -->
<view class="uni-common-mt uni-common-mb">
<text class="uni-tips">第一个枚举值,'' (空字符串) - 空值情况</text>
<enum-data :items="displayEnum" title="display 枚举值" @change="radioChangeDisplay" :compact="true"></enum-data>
<input-data :defaultValue="displayProp" title="display 自定义值" type="text" @confirm="inputChangeDisplay"></input-data>
</view>
</view>
<!-- #ifdef APP -->
</scroll-view>
<!-- #endif -->
</template>
<script setup lang="uts">
import { ItemType } from '@/components/enum-data/enum-data-types'
const display = ref('flex')
const switchDisplay = () => {
display.value = ('flex' == display.value) ? 'none' : 'flex'
}
const displayEnum: ItemType[] = [
{ value: 0, name: '' },
{ value: 1, name: 'flex' },
{ value: 2, name: 'none' }
]
const displayProp = ref('flex')
const displayActual = ref('')
const displayActualText = ref('')
const displayActualImage = ref('')
const viewRef = ref(null as UniElement | null)
const textRef = ref(null as UniTextElement | null)
const imageRef = ref(null as UniImageElement | null)
const getPropertyValues = () => {
displayActual.value = viewRef.value?.style.getPropertyValue('display') ?? ''
displayActualText.value = textRef.value?.style.getPropertyValue('display') ?? ''
displayActualImage.value = imageRef.value?.style.getPropertyValue('display') ?? ''
}
const changeDisplay = (value: string) => {
displayProp.value = value
viewRef.value?.style.setProperty('display', value)
textRef.value?.style.setProperty('display', value)
imageRef.value?.style.setProperty('display', value)
// 使用 nextTick 确保样式已应用后再获取值
nextTick(() => {
getPropertyValues()
})
}
const radioChangeDisplay = (index: number) => {
const selectedItem = displayEnum.find((item): boolean => item.value === index)
if (selectedItem != null) {
changeDisplay(selectedItem.name)
}
}
const inputChangeDisplay = (value: string) => {
changeDisplay(value)
}
onReady(() => {
getPropertyValues()
})
defineExpose({
radioChangeDisplay
})
</script>
<style>
.page {
height: 100%;
}
.head {
margin-top: 10px;
margin-bottom: 10px;
align-items: center;
}
.tip {
color: red;
}
.content {
border: 5px dotted blue;
margin: 10px auto;
padding: 30px;
width: 200px;
height: 150px;
background-color: gray;
align-items: center;
justify-content: center;
}
/* 多组件横向布局样式 */
.test-container {
flex-direction: row;
margin-top: 10px;
}
.test-item {
flex: 1;
margin: 0 5px;
}
.test-box {
width: 100%;
height: 60px;
background-color: gray;
}
.common-view {
height: 50px;
background-color: green;
}
.common-text {
height: 50px;
background-color: green;
font-size: 12px;
color: white;
}
.common-image {
width: 50px;
height: 50px;
background-color: green;
}
</style>