<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>v-model</title>
</head>
<body>
    <div id="app">
        <select name="ball3" id="ball3" v-model="selected">
            <option v-for="op in options" :value="op.value">{{op.text}}</option>
        </select>
        <span>选择：{{selected}}</span>
    </div>

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

    <script>
        let vm = new Vue({
           el:'#app',
           data:{
               options:[
                   {
                       text:'跑步',
                       value:'m1'
                   },
                   {
                       text:'读书',
                       value:'m2'
                   },
                   {
                       text:'游泳',
                       value:'m3'
                   },
               ],
               selected:'m2'
           }
        });
    </script>
</body>
</html>