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Vue的基本组件3.2(v-for)

GeekLiHua

发布于 2025-01-21 04:23:56

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代码可运行

文章被收录于专栏：JavaJava

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代码可运行

简介：本文旨在用最短的篇幅和例子，代入大家入门vue,也是本博主的一个学习记录，本文主要介绍的组件有，v-for。

v-for

功能：该指令可以遍历对象的属性，或者列表。

学习代码1：

<!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</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        <span v-for="(value, key, index) in person">      
            <!-- index是v-for内置的一个属性，从0开始       -->
            <!-- 然后js，key，value就是js中类的键值对 -->
            索引：{{index}} -- 键:{{key}} -- 值: {{value}} <br>
        </span>
    </div>
</body>
    <script>
        const app = new Vue({
            el:"#app",
            data:{
                person:{
                    name:"小陈",
                    age:20
                },
                city:["武汉", "杭州", "合肥"],
                persons:[
                    {id:"1", name:"小陈", age:20, city:"武汉"},
                    {id:"2", name:"小王", age:20, city:"杭州"},
                    {id:"3", name:"小张", age:20, city:"合肥"},
                ]
            },
            methods:{
            }
        });
    </script>
</html>

运行结果：

学习代码2：

<!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</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        <span v-for="(value,key) in person">
            <!-- 如果不写的话，最后索引是没有具体数值的 -->
            索引：{{index}} -- 键：{{key}} -- 值： {{value}} <br>
        </span>          
    </div>
</body>
    <script>
        const app = new Vue({
            el:"#app",
            data:{
                person:{
                    name:"小陈",
                    age:20
                },
                city:["武汉", "杭州", "合肥"],
                persons:[
                    {id:"1", name:"小陈", age:20, city:"武汉"},
                    {id:"2", name:"小王", age:20, city:"杭州"},
                    {id:"3", name:"小张", age:20, city:"合肥"},
                ]
            },
            methods:{
            }
        });
    </script>
</html>

运行结果：

学习代码3：

<!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</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        <!-- :key是自定义键 -->
        <!-- 这里是将索引设置为key -->
        <ul v-for="(item, index) in city" :key="index">
            <li> 索引：{{index}} -- 元素：{{item}}</li>
        </ul>
        
    </div>
</body>
    <script>
        const app = new Vue({
            el:"#app",
            data:{
                person:{
                    name:"小陈",
                    age:20
                },
                city:["武汉", "杭州", "合肥"],
                persons:[
                    {id:"1", name:"小陈", age:20, city:"武汉"},
                    {id:"2", name:"小王", age:20, city:"杭州"},
                    {id:"3", name:"小张", age:20, city:"合肥"},
                ]
            },
            methods:{
            }
        });
    </script>
</html>

运行结果：

学习代码4：

<!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</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        <!-- 对于多重类的遍历方式 -->
        <div v-for="(person,index) in persons" :key="person.id">
            索引：{{index}} -- {{person.name}} {{person.age}}
            {{person.city}}
        </div>        
    </div>
</body>
    <script>
        const app = new Vue({
            el:"#app",
            data:{
                person:{
                    name:"小陈",
                    age:20
                },
                city:["武汉", "杭州", "合肥"],
                persons:[
                    {id:"1", name:"小陈", age:20, city:"武汉"},
                    {id:"2", name:"小王", age:20, city:"杭州"},
                    {id:"3", name:"小张", age:20, city:"合肥"},
                ]
            },
            methods:{
            }
        });
    </script>
</html>