源代码 ：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Vue 测试实例 - 开源教程(ossoft.cn)</title> <script src="https://unpkg.com/vue@next"></script> </head> <body> <div id="app"> <select @change="changeVal($event)" v-model="selOption"> <template v-for="(site,index) in sites" :site="site" :index="index" :key="site.id"> <!-- 索引为 1 的设为默认值，索引值从0 开始--> <option v-if = "index == 1" :value="site.name" selected>{{site.name}}</option> <option v-else :value="site.name">{{site.name}}</option> </template> </select> <div>您选中了:{{selOption}}</div> </div> <script> const app = { data() { return { selOption: "Runoob", sites: [ {id:1,name:"Google"}, {id:2,name:"Runoob"}, {id:3,name:"Taobao"}, ] } }, methods:{ changeVal:function(event){ this.selOption = event.target.value; alert("你选中了"+this.selOption); } } } Vue.createApp(app).mount('#app') </script> </body> </html>
运行结果