Vue+koa2开发一款全栈小程序(3.vue入门、Mpvue入门）

2023-11-20 21:11:58

1.Vue-cli

1.新建一个vue项目

打开cmd

官方命令行工具

npm install -g vue-cli   //安装脚手架

cd到你想要存放demo的目录下，然后

vue init webpack vue-demo //新建demo

其中user EsLint....那一行选项要选n

还有选最后一条时，让你选npm、yarn、No,I can handle it myselft，要选第三个No,I can handle it myselft，不然有可能一整天都新建不完。

然后执行

cd vue-demo
cnpm install
npm run dev

浏览器访问http://localhost:8080 可以看到vue的默认界面

2.数据渲染

用vscode打开vue-demo项目

在main.js

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from ‘vue‘
import App from ‘./App‘
import router from ‘./router‘

Vue.config.productionTip = false

/* eslint-disable no-new */
// new Vue({
//   el: ‘#app‘,
//   router,
//   components: { App },
//   template: ‘<App/>‘
// })

new Vue({
  el:‘#app‘,
  data:{
    title:‘hello vuejs‘,
    subTitle:‘Vue React Angular is good‘,
    showSub:false,
    todos:[‘吃饭‘,‘睡觉‘,‘写代码‘]
  }
})

在index.html中

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>vue-demo</title>
  </head>
  <body>
    <div id="app">
      <p>{{title}}</p>
      <p v-if=‘showSub‘>{{subTitle}}</p>
      <ul>
        <li v-for=‘todo in todos‘>{{todo}}</li>
      </ul>
    </div>
    
    
    <!-- built files will be auto injected -->
  </body>
</html>

浏览器中效果

3.简单事件处理

main.js中

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from ‘vue‘
import App from ‘./App‘
import router from ‘./router‘

Vue.config.productionTip = false

/* eslint-disable no-new */
// new Vue({
//   el: ‘#app‘,
//   router,
//   components: { App },
//   template: ‘<App/>‘
// })

new Vue({
  el:‘#app‘,
  data:{
    title:‘hello vuejs‘,
    subTitle:‘Vue React Angular is good‘,
    showSub:false,
    todos:[‘吃饭‘,‘睡觉‘,‘写代码‘],
    mytodo:‘‘
  },
  methods:{
    handleClick(){
      //this.title=‘你好 小程序‘
      this.todos.push(this.mytodo)
      this.mytodo=‘‘
    }
  }
})

index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>vue-demo</title>
  </head>
  <body>
    <div id="app">
      <p>{{title}}</p>
      <p v-if=‘showSub‘>{{subTitle}}</p>
      <div>
        <input type="text" v-model="mytodo">
        <button @click="handleClick">添加</button>
      </div>
      <ul>
        <li v-for=‘todo in todos‘>{{todo}}</li>
      </ul>
    </div>
    
    
    <!-- built files will be auto injected -->
  </body>
</html>

效果图

4.循环事件处理，计算属性computed（购物车功能用得上）

main.js中

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from ‘vue‘
import App from ‘./App‘
import router from ‘./router‘

Vue.config.productionTip = false

/* eslint-disable no-new */
// new Vue({
//   el: ‘#app‘,
//   router,
//   components: { App },
//   template: ‘<App/>‘
// })

new Vue({
  el:‘#app‘,
  data:{
    title:‘hello vuejs‘,
    subTitle:‘Vue React Angular is good‘,
    showSub:false,
    todos:[
      {text:‘吃饭‘,done:false},
      {text:‘睡觉‘,done:false},
      {text:‘写代码‘,done:false}
    ],
    mytodo:‘‘
  },
  computed:{
    remain(){
      return this.todos.filter(v=>!v.done).length
    }
  },
  methods:{
    handleClick(){
      
      this.todos.push({
        text:this.mytodo,
        done:false
      })
      this.mytodo=‘‘
    },
    toggle(i){
      this.todos[i].done=!this.todos[i].done
    },
    clean(){
      this.todos=this.todos.filter(v=>!v.done)
    }
  }
})

index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>vue-demo</title>
    <style>
      li.done{
        text-decoration: line-through;
        color:‘red‘
      }
    </style>
  </head>
  <body>
    <div id="app">
      <p>{{title}}</p>
      <p v-if=‘showSub‘>{{subTitle}}</p>
      <div>
        <input @keyup.enter="handleClick" type="text" v-model="mytodo">
        <button @click="handleClick">添加</button>
        <button @click="clean">清理</button>
      </div>
      <ul>
        <li :class="{‘done‘:todo.done}" @click="toggle(index)" v-for=‘(todo,index) in todos‘>{{index+1}}:{{todo.text}}</li>
      </ul>
      <p>{{remain}}/{{todos.length}}</p>
      
    </div>
    
    
    <!-- built files will be auto injected -->
  </body>
</html>

5.改造成单文件组件

1.在src目录下新建 Todolist.vue将上面的代码组件化

1.index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>vue-demo</title>
    <style>
      
    </style>
  </head>
  <body>
    <div id="app">
     
    </div>
    
    <!-- built files will be auto injected -->
  </body>
</html>

2.main.js中

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from ‘vue‘
import App from ‘./App‘
import router from ‘./router‘

import Todolist from ‘./Todolist‘

Vue.config.productionTip = false

/* eslint-disable no-new */
// new Vue({
//   el: ‘#app‘,
//   router,
//   components: { App },
//   template: ‘<App/>‘
// })

new Vue({
  el:‘#app‘,
  components:{
    Todolist
  },
  template:‘<Todolist/>‘
  
})

3.Todolist.vue中

<template>
    <div>
      <p>{{title}}</p>
      <p v-if=‘showSub‘>{{subTitle}}</p>
      <div>
        <input @keyup.enter="handleClick" type="text" v-model="mytodo">
        <button @click="handleClick">添加</button>
        <button @click="clean">清理</button>
      </div>
      <ul>
        <li :class="{‘done‘:todo.done}" @click="toggle(key)" v-for=‘(todo,key) in todos‘>{{key+1}}:{{todo.text}}</li>
      </ul>
      <p>{{remain}}/{{todos.length}}</p>
      
    </div>
</template>
<script>
export default {
    data(){
        return {
        title:‘hello vuejs‘,
        subTitle:‘Vue React Angular is good‘,
        showSub:false,
        mytodo:‘‘,
        todos:[
        {text:‘吃饭‘,done:false},
        {text:‘睡觉‘,done:false},
        {text:‘写代码‘,done:false}
        ]
    }
  },
  computed:{
    remain(){
      return this.todos.filter(v=>!v.done).length
    }
  },
  methods:{
    handleClick(){
      
      this.todos.push({
        text:this.mytodo,
        done:false
      })
      this.mytodo=‘‘
    },
    toggle(i){
      this.todos[i].done=!this.todos[i].done
    },
    clean(){
      this.todos=this.todos.filter(v=>!v.done)
    }
  }
}
</script>
<style>
li.done{
        text-decoration: line-through;
        color:‘red‘
      }
</style>

2.将todolist中的title再分出一个组件（组件间传值）

1.Todolist.vue中

<template>
    <div>
        <Title :title="title" :subtitle="subtitle"></Title>
      <div>
        <input @keyup.enter="handleClick" type="text" v-model="mytodo">
        <button @click="handleClick">添加</button>
        <button @click="clean">清理</button>
      </div>
      <ul>
        <li :class="{‘done‘:todo.done}" @click="toggle(key)" v-for=‘(todo,key) in todos‘>{{key+1}}:{{todo.text}}</li>
      </ul>
      <p>{{remain}}/{{todos.length}}</p>
      
    </div>
</template>
<script>
import Title from ‘./components/Title‘

export default {
    components:{
        Title
    },
    data(){
        return {
        title:‘hello vuejs‘,
        subtitle:‘Vue React Angular is good‘,
        showSub:false,
        mytodo:‘‘,
        todos:[
        {text:‘吃饭‘,done:false},
        {text:‘睡觉‘,done:false},
        {text:‘写代码‘,done:false}
        ]
    }
  },
  computed:{
    remain(){
      return this.todos.filter(v=>!v.done).length
    }
  },
  methods:{
    handleClick(){
      
      this.todos.push({
        text:this.mytodo,
        done:false
      })
      this.mytodo=‘‘
    },
    toggle(i){
      this.todos[i].done=!this.todos[i].done
    },
    clean(){
      this.todos=this.todos.filter(v=>!v.done)
    }
  }
}
</script>
<style>
li.done{
        text-decoration: line-through;
        color:‘red‘
      }
</style>

2.在src/components目录下新建组件Title.vue

<template>
    <div class="title">
      <p>{{title}}</p>
      <p>{{subtitle}}</p>
    </div>
</template>
<script>
export default {
    props:[‘title‘,‘subtitle‘]
}
</script>

<style>
    .title{
        color: red;
    }
</style>

2.mpvue入门

1.新建mpvue项目

1.新建mpvue项目，打开cmd，cd到想要放置项目的目录

vue init mpvue/mpvue-quickstart my-project

Project name mpvue-demo
wxmp appid //登录微信小程序后台，找到appid
//然后全都默认即可

2.cd 到my-project

npm install
npm run dev

3.打开微信开发者工具，选择添加项目，项目目录选择my-project

2.生命周期

vue生命周期+兼容小程序生命周期

1.Create 创建初始化

2.Vue不支持的用小程序自己的，比如 onPullDownRefresh（下拉刷新）

3.模板语法

computed+模板+熟悉的html

1.动态style和class使用计算属性返回字符串

2.v-if和v-for用法不变

3.表单v-model全支持

4.模板

除了动态渲染，别的都支持

1..vue单文件组件

2.小程序自带的组件也可以用

3.自带组件事件绑定也使用vue的，比如@click

5.todolist迁移

1.在src/components目录下，新建Todolist.vue组件

<template>
    <div>
        
      <div>
        <input @keyup.enter="handleClick" type="text" v-model="mytodo">
        <button @click="handleClick">添加</button>
        <button @click="clean">清理</button>
      </div>
      <ul>
        <li :class="{‘done‘:todo.done}" @click="toggle(key)" :key="key" v-for=‘(todo,key) in todos‘>{{key+1}}:{{todo.text}}</li>
      </ul>
      <p>{{remain}}/{{todos.length}}</p>
      
    </div>
</template>
<script>
export default {
    data(){
        return {
        title:‘hello vuejs‘,
        subtitle:‘Vue React Angular is good‘,
        showSub:false,
        mytodo:‘‘,
        todos:[
        {text:‘吃饭‘,done:false},
        {text:‘睡觉‘,done:false},
        {text:‘写代码‘,done:false}
        ]
    }
  },
  computed:{
    remain(){
      return this.todos.filter(v=>!v.done).length
    }
  },
  methods:{
    handleClick(){
      
      this.todos.push({
        text:this.mytodo,
        done:false
      })
      this.mytodo=‘‘
    },
    toggle(i){
      this.todos[i].done=!this.todos[i].done
    },
    clean(){
      this.todos=this.todos.filter(v=>!v.done)
    }
  }
}
</script>
<style>
li.done{
        text-decoration: line-through;
        color:‘red‘
      }
</style>

2.在src/pages目录下，新建目录todolist，在todolist目录下新建index.vue和main.js

index.vue

<template>
    <div>
        <h1>vuejs is good</h1>
        <Todolist></Todolist>
    </div>
</template>

<script>
import Todolist from ‘@/components/Todolist‘

export default {
    components:{
        Todolist
    }  
}
</script>
<style>
 h1{
     color: red;
 }
</style>

main.js(通用)

import Vue from ‘vue‘
import App from ‘./index‘

const app = new Vue(App)
app.$mount()

在src/pages/index/index.vue中

3.在src/app.json中，增加路由

4.在package.json中的lint，添加--fix属性

5.修正代码，在cmd里，Ctrl+C y 停止正在运行的项目，执行

npm run lint

6.启动项目

npm run dev