Vue+koa2开发一款全栈小程序(3.vue入门、Mpvue入门）

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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

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