拿来吧你！不想学Vue?我不答应！入门Vue必备基础-看这里！

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篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了拿来吧你！不想学Vue?我不答应！入门Vue必备基础-看这里！相关的知识，希望对你有一定的参考价值。

        

        拿来吧你——Vue官网：https://cn.vuejs.org/

目录

1. 入门必知

1.1 了解Vue

1.2 基础知识

2. 基础必学

2.1 v-text指令

2.2 v-html指令

2.3 v-on指令

2.4 v-show指令

2.5 v-if指令

2.6 v-bind指令

2.7 v-for指令

2.8 v-model指令

3.案例参考

3.1 计数器

3.2 记事本

3.3 轮播图

3.4 天气预报

3.5 看笑话案例

        不想学Vue?我不答应！入门Vue必备基础-看这里！

        手把手教你快速入门，仅需学会几个知识点+小案例，分分钟入门不是大问题！

        所有案例已打包，点击下载：https://download.csdn.net/download/qq_44140450/20360901

1. 入门必知

1.1 了解Vue

        是一套用于构建用户界面的渐进式框架。与其它大型框架不同的是，Vue 被设计为可以自底向上逐层应用。Vue 的核心库只关注视图层，不仅易于上手，还便于与第三方库或既有项目整合。另一方面，当与现代化的工具链以及各种支持类库结合使用时，Vue 也完全能够为复杂的单页应用提供驱动。

1.2 基础知识

        你需要学会：

  1. 引入vue： 
    

<!-- 开发环境版本，包含了有帮助的命令行警告 -->
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>

<!--或者：-->

<!-- 生产环境版本，优化了尺寸和速度 -->
<script src="https://cdn.jsdelivr.net/npm/vue@2"></script>

  2. 掌握几个必要的指令：

  1. v-text指令；
  2. v-html指令；
  3. v-on指令
  4. v-show指令；
  5. v-if指令；
  6. v-bind指令；
  7. v-for指令；
  8. v-model指令

2. 基础必学

2.1 v-text指令

  1. 作用：设置标签的内容。
  2. 默认写法： 
    <p v-text = " msg " ></p>

  3. 差值写法：

    <p>  msg  </p>

  4. 案例

    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-text指令案例</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            left: 50%;
            top: 20%;
            transform: translateY(-20%) translateX(-50%);
        
        #app *
            margin: 10px;
        
        #app ul li
            list-style-type: none;
            border-bottom: 1px solid #666;
            text-align: center;
        
    </style>
</head>
<body>
    <div id="app">
        <h1 v-text = "msg"></h1>
        <ul>
            <li v-text = 'myMsg[0]'></li>
            <li>myMsg[1]</li>
            <li>myMsg[2] + "人"</li>
        </ul>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var vue = new Vue(
            el:"#app",
            data:
                msg:"hello world!",
                myMsg:["海子哥","2749984520@qq.com","吉安永新"]
            
        )
    </script>
</body>
</html>

  5.  效果

2.2 v-html指令

  1. 作用：设置元素innerHtml。
  2. v-html中有html结构会被自动解析为标签。
  3. 与v-text区别
    1. v-text：无论内容是什么，只会解析为文本。
    2. v-html：能自动解析html结构。
  4. 案例 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-html指令</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            left: 50%;
            top: 20%;
            transform: translateY(-20%) translateX(-50%);
        
        #app *
            font-size: 14px;
            color: #666;
            margin: 10px;
            text-align: center;
        
    
    </style>
</head>
<body>
    <div id= 'app' >
        <p v-text = "con"></p>
        <p v-html = "content"></p>
        <p v-text = "content"></p>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var vue = new Vue(
            el:"#app",
            data:
                content:"<a href='https://blog.csdn.net/qq_44140450'>海子哥的主页</a>",
                con:"海子哥",
                myMsg:["海子哥","188207245","吉安永新"]
            
        )
    </script>
</body>
</html>

  5. 运行效果

2.3 v-on指令

  1. 作用：为元素绑定事件。
  2. 写法：
    1. 标准写法 
      <!--以click事件为例-->
<button v-on:click="方法名">按钮</button>

    2. 简写方式

      <!--以click事件为例-->
<input type="button" @click="方法名" value="按钮">

  3. 案例

    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-on指令</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            left: 50%;
            top: 20%;
            transform: translateY(-20%) translateX(-50%);
        
        #app *
            font-size: 14px;
            color: #666;
            margin: 10px;
            text-align: center;
            
        
    </style>
</head>
<body>
    <div id="app">
        <input type="button" v-on:click = "click_on" value="单击鼠标事件">
        <input type="button" v-on:mouseleave = "mouse_leave" value="鼠标离开事件">
        <input type="button" v-on:mouseenter = "mouse_enter" value="鼠标进入事件">
        <input type="button" @mouseenter = "mouse_move" value="鼠标进入事件">
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var vue = new Vue(
            el:"#app",
            methods:
                click_on()
                    alert("单击了按钮");
                ,
                mouse_leave:function()
                    alert("鼠标离开")
                ,
                mouse_enter()
                    alert("鼠标进入！")
                ,
                mouse_move:function()
                    alert("鼠标移动了！")
                
            
            
        )
    </script>
</body>
</html>

  4. 运行效果

2.4 v-show指令

  1. 本质是切换元素的display属性
  2. 作用：根据bool值来定义dispaly属性。
  3. v-show的内容最终解析为一个bool值
  4. 案例 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-show指令</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            width: 960px;
            height: 540px;
            left: 50%;
            top: 0;
            transform: translateX(-50%);
        
        #app *
            display: inline;
            font-size: 14px;
            color: #666;
            margin: 10px;
            text-align: center;
        
        #app button
            top: 0;
            outline: 0;
            border: 1px solid pink;
            background-color: pink;
            border-radius: 5px;
        
        #app button:hover
            transition: 0.3s;
            box-shadow: 0 0 12px rgb(243, 133, 151);
        
        #app img
            width: 960px;
            height: 540px;
        
    </style>
</head>
<body>
    <div id="app">
        <button @click="on">点击查看对象</button>
        <br>
        <img src="./img/1.jpg" v-show="isShow">
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var vue = new Vue(
            el:"#app",
            data:
                isShow:false,
            ,
            methods:
                on:function()
                    this.isShow = !this.isShow;
                
            
        )
    </script>
</body>
</html>

  5. 运行结果

2.5 v-if指令

  1. 本质：修改dom元素。
  2. 作用：根据表达值（bool）切换元素状态。
  3. 表达式值为ture时，元素存在于Dom树中；否则，元素从Dom树中移除。
  4. 频发切换状态下使用v-if，系统资源消耗大，建议这种状态下使用v-show.
  5. 案例 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-if指令</title>
    <!-- border -->
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            width: 960px;
            height: 540px;
            left: 50%;
            top: 0;
            transform: translateX(-50%);
        
        #app *
            display: inline;
            font-size: 14px;
            color: #666;
            margin: 10px;
            text-align: center;
        
        #app button
            top: 0;
            outline: 0;
            border: 1px solid pink;
            background-color: pink;
            border-radius: 5px;
        
        #app button:hover
            transition: 0.3s;
            box-shadow: 0 0 12px rgb(243, 133, 151);
        
        #app img
            width: 960px;
            height: 540px;
        
    </style>
</head>
<body>
    <div id="app">
        <button @click="on">点击一下查看对象</button>
        <img  src="./img/3.jpg" v-if="isShow">
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var vue = new Vue(
            el:"#app",
            data:
                isShow:false,
            ,
            methods:
                on:function()
                    this.isShow = !this.isShow;
                
            
        )
    </script>
</body>
</html>

  6. 运行效果

2.6 v-bind指令

  1. 作用:设置元素属性，为元素绑定属性。
  2. 格式：
    1. 标准写法 
      v-bind:属性名 = 表达式

    2. 简写方式

      :属性名

    3.  动态增删属性的两种方式

      <!--通过类名进行绑定（推荐使用）-->
<p v-bind:属性名="'类名':bool值"></p>



<!--使用三目运算符进行绑定-->
<p :属性名="bool值？'类名':''"></p>

  3.  案例

    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-bind指令</title>
    <style>
       *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            width: 960px;
            height: 540px;
            left: 50%;
            top: 0;
            transform: translateX(-50%);
        
        #app *
            display: inline;
            font-size: 14px;
            color: #666;
            margin: 10px;
            text-align: center;
        
        #app button
            top: 0;
            outline: 0;
            border: 1px solid pink;
            background-color: pink;
            border-radius: 5px;
        
        #app button:hover
            transition: 0.3s;
            box-shadow: 0 0 12px rgb(243, 133, 151);
        
        #app img
            width: 960px;
            height: 540px;
        
        .active
            transition: 0.5s;
            box-shadow: 2px 10px 12px rgb(238, 60, 90);
            border-radius: 30px;
            transform: translateY(-10px) translateZ(-10px);
        
    </style>
</head>
<body>
    <div id="app">
        <button @click="on">点击一下</button>
        <img  v-bind:src="imgSrc"
         :title="title"
         :class="isActive?'active':''">
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var vue = new Vue(
            el:"#app",
            data:
                imgSrc:"./img/7.jpg",
                isShow:false,
                title:"188207245-肖家海",
                isActive:false,
            ,
            methods:
                on:function()
                    this.isActive = !this.isActive;
                
            
        )
    </script>
</body>
</html>

  4. 运行效果

2.7 v-for指令

  1. 响应式生成列表结构。
  2. 作用：根据数据生成列表结构，数组数据经常和v-for结合使用。
  3. 源码案例 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-for指令</title>
    <style>
         *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            left: 50%;
            top: 20%;
            transform: translateX(-50%) translateY(-20%);
        
        #app *
            margin: 10px;
        
        #app input
            top: 0;
            outline: 0;
            border: 1px solid darkslateblue;
            background-color: #fff;
            border-radius: 5px;
        
        #app input:hover
            transition: 0.3s;
            color: #fff;
            background-color: darkslateblue;
            box-shadow: 0 0 12px darkslateblue;
        
        #app li
            list-style-type: none;
            text-align: center;
        
    </style>
</head>
<body>
       
    <div id="app">
        <ul>
            <li v-for="item in arr">
                 item 
            </li>
        </ul>

        <input type="button" value="添加一个阿姨联系方式" @click="add">
        <input type="button" value="移除一个阿姨联系方式" @click="remove">
        <ul>
            <li v-for="(obj,index) in ayi">
                index+1、 obj.name 的电话号码是： obj.phone 
            </li>
        </ul>
    </div>

<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
    var vue = new Vue(
        el:"#app",
        data:
            arr:["上海王阿姨",
            "北京李阿姨",
            "重庆刘阿姨",
            "南京胡阿姨"],
            ayi:[
                name:"上海王阿姨",phone:'1558596521',
                name:"北京李阿姨",phone:'1365520452',
                name:"重庆刘阿姨",phone:'1875554214',
                name:"广州赵阿姨",phone:'1985565421',
                name:"南京胡阿姨",phone:'1865574258'
            ],
        ,
        methods:
            add:function()
                this.ayi.push(name:"江苏苏阿姨",phone:'1998562478');
            ,
            remove:function()
                this.ayi.shift();
            
        
    );
</script> 
</body>
</html>

  4. 运行效果

2.8 v-model指令

  1. v-model是一种双向数据绑定。
  2. 作用：设置、获取表单元素的值。（同时解决了单标签元素无法使用v-text指令的缺点）。
  3. 绑定的数据会和表单元素值进行双向关联。
  4. 代码案例 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-model指令</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            left: 50%;
            top: 20%;
            transform: translateX(-50%) translateY(-20%);
            font-size:0 ;
        
        #app *
            height: 30px;
            border: 1px solid darkslateblue;
            outline: 0;
            font-size: 0;
            font-size:18px ;
        
        #app input[type="text"]
            padding-left: 5px;
            width: 200px;
            border-radius: 10px 0px 0 10px;
        
        #app input[type="button"]
            width: 60px;
            height: 32px;
            border-radius: 0 10px 10px 0;
            vertical-align: top;
            background-color: darkslateblue;
            color: #fff;
        
        #app input[type="button"]:hover
            transition: 0.3s;
            box-shadow: 0 0 12px darkslateblue;
        
    </style>
</head>
<body>
    <div id="app">
        <input type="text" @keyup.enter = "enter" v-model="val"><!--
       --><input type="button" value="按他" @click="enter">
    </div>

<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
    var vue = new Vue(
        el:"#app",
        data:
            val:"",
        ,
        methods:
            enter:function()
                if(this.val.trim() != "")
                    alert("value:"+this.val);
            
        
    );
</script> 
</body>
</html>

  5. 运行效果

3.案例参考

3.1 计数器

  1. 参考源码 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>counter</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #context
            position:absolute;
            /* background-color: aquamarine; */
            display: inline-block;
            left: 50%;
            top: 50%;

            transform: translateX(-50%) translateY(-50%);
        
        #app
            border-radius: 5px;
            box-shadow: 0 0 5px #666;
        
        #app button
            width: 60px;
            height: 40px;
            border: 0;
            outline: none;
            /* border-radius: 5px; */
            background-color: #ccc;
            font-size: 28px;
        
        #app button:hover
            transition:  0.5s;
            background-color: darkslateblue;
            color: #fff;
            /* box-shadow: 0 0 5px darkslateblue; */
        
        #app span
            margin: 20px;
            font-size: 18px;
        
    </style>
</head>
<body>
    <div id="context">
        <div id="app">
            <button @click="sub" style="border-radius:5px 0 0 5px;">-</button>
            <span > num </span>
            <button @click="add" style="border-radius:0 5px 5px 0;">+</button>
        </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var vue = new Vue(
            el:"#app",
            data:
                num:1,
            ,
            methods:
                add:function()
                    this.num = this.num >= 10? this.num:this.num+1;
                ,
                sub:function()
                    this.num = this.num <=1 ? this.num:this.num-1;
                
            
        )
    </script>
</body>
</html>

  2. 运行效果

3.2 记事本

  1. 参考源码 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>记事本</title>
    <style>
        *
            margin: 0;
            padding: 0;
            font-family: "YouYuan";
        
        #notepad
            position: absolute;
            width: 50%;
            height: 50%;
            left:50%;
            top:50%;
            transform: translateX(-50%) translateY(-50%);
            box-shadow: 0 0 8px #666;
            border-radius: 10px;
        
        #notepad div
            width: 100%;
            height: 60%;
            overflow: auto;
        
        #notepad h1
            width: 100%;
            padding-top: 10px;
            margin-bottom: 10px;
            text-align: center;
        
        #notepad ul
            width: 90%;
            margin-left: 5%;
        
        #notepad ul li
            list-style-type: none;
            padding-left: 10px;
            /* border-bottom: 1px solid #666; */
            font-size: 18px;
            padding-bottom: 5px;
            padding-top: 5px;
        
        #notepad ul li:hover input
            visibility:visible;
        
        #notepad input[type="text"]
            width: 60%;
            margin-left: 10%;
            height: 25px;
            margin-bottom: 5px;
            margin-top: 5px;
            margin-right: 0;
            border:0;
            font-size: 18px;
            outline: none;
            border-radius: 5px 0 0 5px;
            box-shadow: 0 0 5px darkslateblue;
        
        #notepad #sure
            width: 50px;
            height: 25px;
            margin-bottom: 5px;
            margin-top: 5px;
            margin-left: -6px;
            border:0;
            outline: none;
            border-radius: 5px;
            background-color: darkslateblue;
            color: #fff;
            transform: translateY(-1px);
             border-radius:0 5px 5px 0;
        
        #notepad #sure:hover
            transition: 0.3s;
            box-shadow: 0 0 5px darkslateblue;
        

        #notepad #left-p
            float:left;
            margin: 15px auto 5px 5px;
            border-bottom: 1px solid darkslateblue;
        
        #notepad #right-but
            float:right;
            border-radius: 5px;
            margin: 15px 5px 5px auto;
            border: 1px solid darkslateblue;
        
        #notepad #right-but:hover
            transition: 0.3s;
            background-color: darkslateblue;
            color: #fff;
            box-shadow: 0 0 5px red;
        
        #notepad .remove-but
            visibility: hidden;
            width: 20px;
            height: 20px;
            color: red;
            border-radius: 20px;
            float: right;
            border: 0;
            text-align: center;
            margin-right: 5px;
            font-size: 18px;
        
    </style>
</head>
<body>
    <div id="notepad">
        <h1>记事本</h1>
        <input type="text" v-model="addVal" @keyup.enter="add">
        <input type="button" id="sure" value="确认" @click="add">
        <div>
            <ul >
                <li v-for="(item,index) in val" >
                    index+1. item 
                    <input class="remove-but" type="button" value="-" @click="clean(index)" >
                </li>
            </ul>
         </div>

        <p id="left-p" v-if = "val.length != 0">已有事务val.length条</p>
        <input id="right-but" v-show = "val.length != 0" type="button" value="全部清除" @click = "cleanAll">
    </div>

    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
    var vue = new Vue(
        el:"#notepad",
        data:
            val:[],
            addVal:"",
            isShowCleanBut:false,
        ,
        methods:
            add:function()
                if(this.addVal.trim() != "")
                    this.val.push(this.addVal.trim());
                    this.addVal="";
                
            ,
            clean:function(index)
                this.val.splice(index,1);
            ,
            cleanAll:function()
                this.val=[];
            
        
    );
</script> 
</body>
</html>

  2.  运行效果

3.3 轮播图

  1. 参考源码 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>轮播图</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            width: 100%;
            height: 100%;
        
        #context
            position: absolute;
            left:50%;
            top: 50%;
            transform: translateX(-50%) translateY(-50%);
        
        img
            width: 768px;
            height: 432px;
        
        #app img
            transition: all 0.3s;
            display: inline-block;
        
        #app button
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            margin: 2px;
            width: 30px;
            height: 60px;
            border: 0;
            outline: none;
            color: #fff;
            font-size: 18px;
            border-radius: 2px;
            background-color: rgba(58, 58, 58, 0.548);
        
        #app button:hover
            transition: 0.3s;
            box-shadow: 0 0 5px #666;
        
    </style>
</head>
<body>
    <div id="app">
        <div id = "context">
            <button style="float: left;" @click="sub" >◀</button>
            <img  v-bind:src="imgSrc[index]">
            <button style="float: right;transform:translateX(-34px) translateY(-50%);" @click="add">▶</button>
        </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var vue = new Vue(
            el:"#app",
            data:
                imgSrc:["./img/7.jpg",
                        "./img/1.jpg",
                        "./img/2.jpg",
                        "./img/3.jpg",
                        "./img/4.jpg",
                        "./img/5.jpg",
                        "./img/6.jpg"],
                index: 0,
            ,
            methods:
                add:function()
                    this.index =this.index < this.imgSrc.length-1? this.index + 1 :0;
                ,
                sub:function()
                    this.index = this.index > 0? this.index - 1:this.imgSrc.length-1;
                
            
        );
    </script>
</body>
</html>

  2. 运行效果

3.4 天气预报

  1. 参考源码 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>查询天气案例</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            width: 60%;
            height: 50%;
            top: 10%;
            left: 50%;
            transform: translateX(-50%) translateY(-10%);
        
        /* #app .form_group
            margin-bottom: 5px;
         */
        #app .form_group input,
        #app .form_group button 
            
            margin: 0;
            padding: 0;
            display: inline-block;
            outline:none; 
            
            
        
        #app .form_group input[type='text']
            height: 31px;
            font-size: 15px;
            width: 80%;
            border: 2px solid darkslateblue;
        
        #app .form_group button
            background-color: darkslateblue;
            color: #fff;
            width: 15%;
            height: 35px;
            border: 0;
            vertical-align: top;
            transform: translateX(-1px);
        

        #app .hot-city
            margin: 5px;
        
        #app .hot-city a
            font-size: 14px;
            color: #666;
            text-decoration: none;
        

        #app .weather-list li
            display: inline-block;
            /* background-color: darkslategray; */
            padding: 15px;
            border-right: 1px solid #666;
        
       
        #app ul :nth-last-child(1)
            border: 0;
        
        #app .info_type,
        #app .info_temp,
        #app .info-date
            text-align: center;
            padding-bottom: 15px;
        
        #app .info_type
            color: darkslateblue;
            font-size: 16px;
           
        
        #app .info_temp
            color: darkslateblue;
            font-size: 8px;
        
        #app .info-date
            color: #666;
        
    </style>
</head>
<body>
    <div id="app">
        <div>
            <div class="form_group">
                <input type="text" @keyup.enter="down" v-model="city"><!----><button @click="down">查询</button>
            </div>
            <div class="hot-city">
                <a href="javascript:;" @click="hot_city('北京')">北京</a>
                <a href="javascript:;" @click="hot_city('上海')">上海</a>
                <a href="javascript:;" @click="hot_city('广州')">广州</a>
                <a href="javascript:;" @click="hot_city('深圳')">深圳</a>
                <a href="javascript:;" @click="hot_city('南昌')">南昌</a>
            </div>
        </div>
        <ul class="weather-list" >
            <li v-for="item in weatherList">
                <div class="info_type">
                    <span class="iconfont">
                       item.type 
                    </span>
                </div>
                <div class="info_temp">
                    <b>
                        item.low
                    </b>
                    ~
                    <b>
                        item.high
                    </b>
                </div>
                <div class="info-date">
                    <span>
                        item.date
                    </span>
                </div>
            </li>
        </ul>
     </div>

 <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
 <script>
     var vue = new Vue(
         el:"#app",
         data:
             city:"",
             weatherList:[],
         ,
         methods:
             down:function()
                 var that = this;
                 axios.get("http://wthrcdn.etouch.cn/weather_mini?city="
                 +this.city).then(
                     function(response)
                        that.weatherList = response.data.data.forecast;
                    ,function(err)alert("连接失败！")
                )
             ,
             hot_city(city)
                this.city=city;
                this.down();
             
         
     );
 </script> 
</body>
</html>

  2. 运行效果

3.5 看笑话案例

  1. 参考源码 
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>看笑话</title>
    <style>
        *
            margin: 0;
            padding: 0;
        
        #app
            position: absolute;
            left: 50%;
            top: 20%;
            transform: translateX(-50%) translateY(-20%);
            font-size:0 ;
            margin: 5px;
        
        #app *
            margin: 5px;
            outline: none;
            border: 1px solid darkslateblue;
        
        #app input
            position: relative;
            width: 100px;
            height: 26px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 13px;
        
        #app input:hover
            transition: 0.3s;
            color: #fff;
            background-color: darkslateblue;
            box-shadow:  0 0 12px darkslateblue;
        
        #app textarea
            width: 600px;
            height: 300px;
        
    </style>
</head>
<body>
    <div id="app">
        <input type="button" value="来一个笑话" @click="down">
        <textarea > text </textarea>
     </div>

 <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
 <script>
     var vue = new Vue(
         el:"#app",
         data:
             text:"",
         ,
         methods:
             down:function()
                 var that = this;
                 axios.get("https://autumnfish.cn/api/joke").then(
                     function(response)
                         var str= response.data;
                        that.text = response.data;
                    ,function (err)alter("连接失败！")
                )
             ,
         
     );
 </script> 
</body>
</html>

  2. 运行效果

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