<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>复选框</title>
</head>
<body>
    <div id="app">
        <p>请选择语言，已选择{{languages.length}}种</p>
        <br>
        <input type="checkbox" id="python" value="python" v-model="languages">
        <label for="python">python</label>
        <input type="checkbox" id="javascript" value="javascript" v-model="languages">
        <label for="javascript">javascipt</label>
        <input type="checkbox" id="php" value="php" v-model="languages">
        <label for="php">php</label>
    </div>

    <script src="../js/vue.js"></script>

    <script>
        let vm = new Vue({
            el:'#app',
            data:{
                languages:[]
            }
        });
    </script>
</body>
</html>