<!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 type="text/javascript" src="../js/vue.js"></script> </head> <body> <div id="root"> <h2>今天天气很{{info}}</h2> <!-- 绑定事件的时候: @xxx="yyy" yyy可以写一些简单的语句 --> <!-- <button @click="isHot = !isHot">切换天气</button> --> <button @click="changeWeather">切换天气</button> </div> </body> <script type="text/javascript"> Vue.config.productionTip = false const vm = new Vue({ el:'#root', data:{ isHot:true, }, computed:{ info(){ return this.isHot ? '炎热' : '凉爽' } }, methods: { changeWeather(){ this.isHot = !this.isHot } }, }) </script> </html>