什么Vue？

news2024/11/28 22:52:28

引入vue.js的方法：

<script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>

例子：

v-model：以v-开头的叫做指令

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>
<body>

    <div id="app">

        <input type="text" v-model="message">
        {{ message }}

    </div>

    <script>
        //定义vue对象（视图层上数据变化，数据模型就是改变，数据模型改变，也会影响视图层的展示）双向数据绑定
        new Vue({
            el: "#app",//vue接管区域
            data: {
                message: "hello Vue"
            }
        });
    </script>
</body>
</html>

常见指令

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>
<body>

    <div id="app">

        <input type="text" v-model="url">

        //两种写法
        <a v-bind:href="url">{{url}}</a>
        <a :href="url">{{url}}</a>

        //两种写法
        <input type="button" value="按钮" v-on:click="handle()">
        <input type="button" value="按钮" @click="handle()">
        

    </div>
    
    <br><br>

    <div id="app2">

        <input type="text" v-model = "age">
        <span>年龄:{{age}},经过判断为</span>
        <span v-if="25 >= age">年轻人</span>
        <span v-else-if="age > 25 && 60 > age">中年人</span>
        <span v-else>老年人</span>
    </div>

    <script>
        //定义vue对象（视图层上数据变化，数据模型就是改变，数据模型改变，也会影响视图层的展示）双向数据绑定
        new Vue({
            el: "#app",//vue接管区域
            data: {
                url:"https://www.itcast.cn",
            },
            methods:{
                handle:function(){
                    alert('我被点击了');
                }
            }
        });

        new Vue({
            el:"#app2",
            data:{
                age:30,
            }
        });
    </script>
</body>
</html>

案例：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
    <style>
        table {
            width: 60%;
            border-spacing: 0; /* 设置表格单元格之间的间距为 0 */
        }

        th, td {
            border: 1px solid black; /* 设置单元格边框 */
            padding: 8px; /* 设置单元格内边距 */
            text-align: center; /* 文本居中 */
        }
    </style>
</head>
<body>
    <div id="app">
        <table>
            <tr>
                <th>编号</th>
                <th>姓名</th>
                <th>年龄</th>
                <th>性别</th>
                <th>成绩</th>
                <th>等级</th>
            </tr>
    
            <tr v-for="(user,index) in User">
                <td>{{index+1}}</td>
                <td>{{user.name}}</td>
                <td>{{user.age}}</td>
                <td>{{user.gender}}</td>
                <td>{{user.garden}}</td>
                <td>
                    <span v-show="user.garden >= 90">优秀</span>
                    <span v-show="user.garden >= 60 && 90 > user.garden">合格</span>
                    <span v-show="60 > user.garden"><strong style="color: red;">不及格</strong></span>
                </td>
            </tr>
        </table>
    </div>

    <script>
        new Vue({
            el: "#app",//vue接管区域
            data: {
                User:[
                    {
                    name:"张光鹏",
                    age:17,
                    gender:"男",
                    garden:89,
                     },
                     {
                    name:"黄洁",
                    age:18,
                    gender:"女",
                    garden:90,
                    },
                     {
                    name:"张鸣",
                    age:17,
                    gender:"男",
                    garden:69,
                    },
                     {
                    name:"宋鹏",
                    age:27,
                    gender:"男",
                    garden:29,
                    },
                     {
                    name:"傻的",
                    age:107,
                    gender:"女",
                    garden:100,
                    }
                 ]
            },
            methods:{
                handle:function(){
                    alert('我被点击了');
                }
            }
        });

    </script>
</body>
</html>