<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script src="./lib/vue-2.4.0.js"></script> </head> <body> <div id="app"> <input type="button" value="toggle" @click="flag=!flag"> <!-- 需求： 点击按钮，让 h3 显示，再点击，让 h3 隐藏 --> <h3 v-if="flag">这是一个H3</h3> </div> <script> // 创建 Vue 实例，得到 ViewModel var vm = new Vue({ el: '#app', data: { flag: false }, methods: {} }); </script> </body> </html>