<!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="./vue.js"></script> </head> <body> <div id="app"> 點擊次數：{{counter}} <br/> <button @click="handleAdd()">+1</button> <button @click="handleAdd(10)">+10</button> </div> <script> new Vue({ el:'#app', data:{ counter:0 }, methods:{ handleAdd:function(count){ count=count || 1; //默認1 this.counter+=count; } } }) </script> </body> </html>