简体中文
简体中文
# opacity
opacity 属性指定了一个元素的不透明度。换言之，opacity 属性指定了一个元素后面的背景的被覆盖程度。
# uni-app x 兼容性
| Web | Android | iOS | HarmonyOS | HarmonyOS(Vapor) |
|---|---|---|---|---|
| 4.0 | 3.9 | 4.11 | 4.61 | 5.0 |
# 语法
opacity: <alpha-value>;
# 值限制
- number(0-1)
# 默认值
1
# 示例
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 style="flex-grow: 1;">
<view class="demo-row">
<view class="demo-item">
<text>opacity: 1 (默认值)</text>
<view class="common" style="opacity: 1;"></view>
</view>
<view class="demo-item">
<text>拍平</text>
<view class="common" style="opacity: 1;" flatten></view>
</view>
</view>
<view class="demo-row uni-common-mt">
<view class="demo-item">
<text>opacity: 0.8</text>
<view class="common" style="opacity: 0.8;"></view>
</view>
<view class="demo-item">
<text>拍平</text>
<view class="common" style="opacity: 0.8;" flatten></view>
</view>
</view>
<view class="demo-row uni-common-mt">
<view class="demo-item">
<text>opacity: 0.5</text>
<view class="common" style="opacity: 0.5;"></view>
</view>
<view class="demo-item">
<text>拍平</text>
<view class="common" style="opacity: 0.5;" flatten></view>
</view>
</view>
<view class="demo-row uni-common-mt">
<view class="demo-item">
<text>opacity: 0.2</text>
<view class="common" style="opacity: 0.2;"></view>
</view>
<view class="demo-item">
<text>拍平</text>
<view class="common" style="opacity: 0.2;" flatten></view>
</view>
</view>
<view class="demo-row uni-common-mt">
<view class="demo-item">
<text>opacity: 0</text>
<view class="common" style="opacity: 0;"></view>
</view>
<view class="demo-item">
<text>拍平</text>
<view class="common" style="opacity: 0;" flatten></view>
</view>
</view>
<view class="uni-common-mt">
<text class="uni-title-text">setProperty 设置与 getPropertyValue 获取 opacity </text>
</view>
<!-- 普通版本 -->
<view class="test-container">
<view class="test-item">
<text class="uni-subtitle-text">view 组件</text>
<text class="uni-info">设置值: {{opacity}}</text>
<text class="uni-info">获取值: {{opacityActual}}</text>
<view class="test-box">
<view ref="viewRef" class="common test-view" :style="{ opacity: opacity }">
<text class="common-text">view</text>
</view>
</view>
</view>
<view class="test-item">
<text class="uni-subtitle-text">text 组件</text>
<text class="uni-info">设置值: {{opacity}}</text>
<text class="uni-info">获取值: {{opacityActualText}}</text>
<view class="test-box">
<text ref="textRef" class="common test-text" :style="{ opacity: opacity }">text</text>
</view>
</view>
<view class="test-item">
<text class="uni-subtitle-text">image 组件</text>
<text class="uni-info">设置值: {{opacity}}</text>
<text class="uni-info">获取值: {{opacityActualImage}}</text>
<view class="test-box">
<image ref="imageRef" class="common test-image" :style="{ opacity: opacity }" src="/static/test-image/logo.png"></image>
</view>
</view>
</view>
<!-- 拍平版本 -->
<view class="test-container">
<view class="test-item">
<text class="uni-subtitle-text">view 组件拍平</text>
<text class="uni-info">设置值: {{opacity}}</text>
<text class="uni-info">获取值: {{opacityActualFlat}}</text>
<view class="test-box">
<view ref="viewRefFlat" class="common test-view-flatten" :style="{ opacity: opacity }" flatten>
<text class="common-text">view</text>
</view>
</view>
</view>
<view class="test-item">
<text class="uni-subtitle-text">text 组件拍平</text>
<text class="uni-info">设置值: {{opacity}}</text>
<text class="uni-info">获取值: {{opacityActualTextFlat}}</text>
<view class="test-box">
<text ref="textRefFlat" class="common test-text-flatten" :style="{ opacity: opacity }" flatten>text</text>
</view>
</view>
<view class="test-item">
<text class="uni-subtitle-text">image 组件拍平</text>
<text class="uni-info">设置值: {{opacity}}</text>
<text class="uni-info">获取值: {{opacityActualImageFlat}}</text>
<view class="test-box">
<image ref="imageRefFlat" class="common test-image-flatten" :style="{ opacity: opacity }" flatten src="/static/test-image/logo.png"></image>
</view>
</view>
</view>
<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="opacityEnum" title="opacity 枚举值" @change="radioChangeOpacity" :compact="true"></enum-data>
<input-data :defaultValue="opacity" title="opacity 自定义值" type="text" @confirm="inputChangeOpacity"></input-data>
</view>
</view>
<!-- #ifdef APP -->
</scroll-view>
<!-- #endif -->
</template>
<script setup lang="uts">
import { ItemType } from '@/components/enum-data/enum-data-types'
const opacityEnum: ItemType[] = [
{ value: 0, name: '' },
{ value: 1, name: '0' },
{ value: 2, name: '0.2' },
{ value: 3, name: '0.5' },
{ value: 4, name: '0.8' },
{ value: 5, name: '1' }
]
const opacity = ref('1')
const opacityActual = ref('')
const opacityActualText = ref('')
const opacityActualImage = ref('')
const opacityActualFlat = ref('')
const opacityActualTextFlat = ref('')
const opacityActualImageFlat = ref('')
const viewRef = ref(null as UniElement | null)
const textRef = ref(null as UniTextElement | null)
const imageRef = ref(null as UniImageElement | null)
const viewRefFlat = ref(null as UniElement | null)
const textRefFlat = ref(null as UniTextElement | null)
const imageRefFlat = ref(null as UniImageElement | null)
const getPropertyValues = () => {
opacityActual.value = viewRef.value?.style.getPropertyValue('opacity') ?? ''
opacityActualFlat.value = viewRefFlat.value?.style.getPropertyValue('opacity') ?? ''
opacityActualText.value = textRef.value?.style.getPropertyValue('opacity') ?? ''
opacityActualTextFlat.value = textRefFlat.value?.style.getPropertyValue('opacity') ?? ''
opacityActualImage.value = imageRef.value?.style.getPropertyValue('opacity') ?? ''
opacityActualImageFlat.value = imageRefFlat.value?.style.getPropertyValue('opacity') ?? ''
}
const changeOpacity = (value: string) => {
opacity.value = value
viewRef.value?.style.setProperty('opacity', value)
viewRefFlat.value?.style.setProperty('opacity', value)
textRef.value?.style.setProperty('opacity', value)
textRefFlat.value?.style.setProperty('opacity', value)
imageRef.value?.style.setProperty('opacity', value)
imageRefFlat.value?.style.setProperty('opacity', value)
// 使用 nextTick 确保样式已应用后再获取值
nextTick(() => {
getPropertyValues()
})
}
const radioChangeOpacity = (index: number) => {
const selectedItem = opacityEnum.find((item): boolean => item.value === index)
if (selectedItem != null) {
changeOpacity(selectedItem.name)
}
}
const inputChangeOpacity = (value: string) => {
changeOpacity(value)
}
onReady(() => {
getPropertyValues()
})
defineExpose({
radioChangeOpacity
})
</script>
<style>
.demo-row {
flex-direction: row;
justify-content: space-between;
}
.demo-item {
flex: 1;
margin: 0 5px;
}
.common {
width: 80px;
height: 80px;
background-color: blue;
}
.common-text {
width: 50px;
}
.test-container {
flex-direction: row;
justify-content: space-between;
margin-top: 10px;
}
.test-item {
flex: 1;
margin: 0 5px;
}
.test-box {
width: 100%;
height: 80px;
background-color: gray;
}
</style>
