陪诊小程序之uniapp(从入门到精通)

1.uniapp如何使用vue3编写页面

<template><view class="content"><navbar name="navbar组件"></navbar><image class="logo" src="/static/logo.png"></image><view class="text-area"><text class="title">{{title}}</text></view><view class="">11111</view><button @click="handleClick">点我</button><text>总共购买的水果数量{{totalNum}}</text><my-component></my-component><aComponent></aComponent><navbar></navbar><view v-for="item in list" :key="item.name"><view>1111</view><text>{{item.name}}</text><text>{{item.num}}</text></view></view>
</template><script setup>import  aComponent  from '../../../project/component/component.vue';import{ref,reactive,computed} from 'vue'import{onLoad} from '@dcloudio/uni-app'const title=ref('Hello')const list=reactive([{name:'apple',num:1},{name:'orange',num:2},{name:'banana',num:3}])const handleClick=()=>{list.forEach(item=>{item.num++})}onLoad(()=>{console.log('onLode生命周期')})const totalNum=computed(()=>{return list.reduce((total,cur)=>total+cur.num,0)})
</script><style>.content {display: flex;flex-direction: column;align-items: center;justify-content: center;}.logo {height: 200rpx;width: 200rpx;margin-top: 200rpx;margin-left: auto;margin-right: auto;margin-bottom: 50rpx;}.text-area {display: flex;justify-content: center;}.title {font-size: 36rpx;color: #8f8f94;}
</style>

引入组件的三种方式

全局引入

1.引入

import componentVue from './component/component.vue'

2.全局注册

export function createApp() {
const app = createSSRApp(App)
app.component('my-component',componentVue)
return {
app
}
}

3.页面中引入

<my-component></my-component>

局部引入

<script setup>
   import aComponent from '../../../project/component/component.vue';

   import{ref,reactive,computed} from 'vue'
   import{onLoad} from '@dcloudio/uni-app'
   const title=ref('Hello')
   const list=reactive([
       {name:'apple',num:1},
       {name:'orange',num:2},
       {name:'banana',num:3}
   ])
   const handleClick=()=>{
       list.forEach(item=>{
           item.num++
       })
   }
   onLoad(()=>{
       console.log('onLode生命周期')
   })
   const totalNum=computed(()=>{
       return list.reduce((total,cur)=>total+cur.num,0)
   })
</script>

<aComponent></aComponent>

自动引入

新建文件夹然后新建组件

组件引入

	<navbar></navbar>

2.uniapp组件通信props和$emit和插槽语法

props

组件

<template><view>navbar组件</view>
</template><script setup>
import { defineProps } from 'vue';
defineProps(['name','content'])</script><style></style>

组件引入数据

<navbar name="navbar组件" :content="data"></navbar>

父组件(页面)向子组件传值,如果没传就用默认值

<template><view>navbar组件<view>组件的name属性{{name}}</view><view>组件的content属性{{content}}</view></view>
</template><script setup>
import { defineProps } from 'vue';
// defineProps(['name','content'])
defineProps({
name:String,	content:{type:String,default:()=>{return '默认值';}}	
})</script><style></style>

$emit

navbar.vue

<template>
   <view>
       navbar组件
       <view>组件的name属性{{name}}</view>
       <view>组件的content属性{{content}}</view>
       <button @click="handleChange">修改content</button>
   </view>
</template>

<script setup>
import { defineProps,defineEmits } from 'vue';
// defineProps(['name','content'])
defineProps({
name:String,
   content:{
       type:String,
       default:()=>{
           return '默认值';
       }
   }

})
const emit=defineEmits(['changeData'])
const handleChange=()=>{
   emit('changeData','修改后的数据')
}

</script>

<style>

</style>

<navbar :name="navbar组件" :content="data" @changeData="changeData"></navbar>

插槽语法

<navbar :name="navbar组件" :content="data" @changeData="changeData">
<view>我是插槽的内容</view>
</navbar>

<template>
       <view>组件</view>
       <view>组件的name属性{{name}}</view>
       <view>组件的content属性{{content}}</view>
       <slot></slot>
       <button @click="handleChange">修改content</button>
</template>

<script setup>
import { defineProps,defineEmits } from 'vue';
// defineProps(['name','content'])
defineProps({
name:String,
   content:{
       type:String,
       default:()=>{
           return '默认值';
       }
   }

})
const emit=defineEmits(['changeData'])
const handleChange=()=>{
   emit('changeData','修改后的数据')
}

</script>

<style>

</style>

3.系统参数获取和navBar组件样式动态设计

<template><view class="nav"><view :style="'height:'+status+'rpx;'+containerStyle"></view><view class="navbar" :style="'height:'+navHeight+'rpx;'+containerStyle"></view></view>
</template><script setup>import { ref,onBeforeMount,defineProps } from 'vue';const props=defineProps({background:{type:String,default:'rgba(255,255,255,1)'},color:{type:String,default:'rgba(0,0,0,1)'},fontSize:{type:String,default:32},icoWidth:{type:String,default:116},iconHeight:{type:String,default:38}})onBeforeMount(()=>{setNavSize()setStyle()})//状态栏高度const status=ref(0)//内容高度const navHeight=ref(0)//背景颜色const containerStyle=ref('')//字体样式const textStyle=ref('')//图标的样式const iconStyle=ref('')//计算状态栏高度const setNavSize=()=>{const {system,statusBarHeight}=uni.getSystemInfoSync()status.value=statusBarHeight*2// console.log(res)const isiOS=system.indexOf('iOS')>-1if(!isiOS){navHeight.value=96}else{navHeight.value=88}// console.log(res)	}const setStyle=()=>{containerStyle.value=['background:'+props.background].join(";")	textStyle.value=['color:'+props.color,'font-size'+props.fontSize+'rpx'].join(';')iconStyle.value=['width:'+props.icoWidth+'rpx','height:'+props.iconHeight+'rpx'].join(';')}</script><style>.nav{position: fixed;width: 100%;top: 0;left: 0;z-index: 2;}</style>

4.页面栈获取和navBar跳转逻辑实现

index.vue

<template><view class="content"><navbar titleText="首页"></navbar>	<button style="margin-top: 130rpx;" @click="navigateTo">跳转</button></view>
</template><script setup>import  aComponent  from '../../../project/component/component.vue';import{ref,reactive,computed} from 'vue'import{onLoad} from '@dcloudio/uni-app'const data=ref("动态数组")const title=ref('Hello')const list=reactive([{name:'apple',num:1},{name:'orange',num:2},{name:'banana',num:3}])const handleClick=()=>{list.forEach(item=>{item.num++})}const changeData=(val)=>{data.value=val}onLoad(()=>{console.log('onLode生命周期')})const totalNum=computed(()=>{return list.reduce((total,cur)=>total+cur.num,0)})const navigateTo=()=>{console.log(1111)uni.navigateTo({url:'/pages/search/index'})	}</script><style>.content {display: flex;flex-direction: column;align-items: center;justify-content: center;}.logo {height: 200rpx;width: 200rpx;margin-top: 200rpx;margin-left: auto;margin-right: auto;margin-bottom: 50rpx;}.text-area {display: flex;justify-content: center;}.title {font-size: 36rpx;color: #8f8f94;}</style>

navbar.vue

<template><view class="nav"><view :style="'height:'+status+'rpx;'+containerStyle"></view><view class="navbar" :style="'height:'+navHeight+'rpx;'+containerStyle"><view class="back-icon" @click="backOrHome"><image v-if="pages>1" src="../../static/resource/navbar/ic_back.png" mode=""></image><image v-else src="../../static/resource/navbar/ic_home.png" mode=""></image></view><view class="nav-title" v-if="titleText"><view :style="'height:'+navHeight+'rpx;line-height:'+navHeight+'rpx;'+textStyle">{{titleText}}</view>	</view></view></view>
</template><script setup>import { ref,onBeforeMount,defineProps } from 'vue';const props=defineProps({background:{type:String,default:'rgba(255,255,255,1)'},color:{type:String,default:'rgba(0,0,0,1)'},fontSize:{type:String,default:32},icoWidth:{type:String,default:116},iconHeight:{type:String,default:38},titleText:{type:String,default:''}})onBeforeMount(()=>{setNavSize()setStyle()// const pages = getCurrentPages().length;//     console.log('当前页面栈的长度:', pages);})//状态栏高度const status=ref(0)//内容高度const navHeight=ref(0)//背景颜色const containerStyle=ref('')//字体样式const textStyle=ref('')//图标的样式const iconStyle=ref('')//页面栈的数量const pages=ref(getCurrentPages().length)console.log(pages.value,'page')//计算状态栏高度const setNavSize=()=>{const {system,statusBarHeight}=uni.getSystemInfoSync()status.value=statusBarHeight*2// console.log(res)const isiOS=system.indexOf('iOS')>-1if(!isiOS){navHeight.value=96}else{navHeight.value=88}// console.log(res)	}const setStyle=()=>{containerStyle.value=['background:'+props.background].join(";")	textStyle.value=['color:'+props.color,'font-size'+props.fontSize+'rpx'].join(';')iconStyle.value=['width:'+props.icoWidth+'rpx','height:'+props.iconHeight+'rpx'].join(';')}const backOrHome=()=>{if(pages.value>1){uni.navigateBack();}else{uni.switchTab({url:'/pages/index/index'})}}</script><style>.nav{position: fixed;width: 100%;top: 0;left: 0;z-index: 2;}.back-icon{display: flex;align-items: center;width: 64rpx;height: 100%;margin-left:20rpx ;}.back-icon image{width: 64rpx;height: 64rpx;	}.navbar{position:relative;}.nav-title{position: absolute;top: 0;left: 50%;transform: translate(-50%);}</style>