Vue Methods Option 方法选项

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Vue Methods Option</title>
    <script type="text/javascript" src="../assets/js/vue.js"></script>
</head>
<body>
<h1>Vue Methods Option</h1>
<hr>
<div id="app">
    {{message}}
    <p><button @click="add(5,$event)">add</button></p>
   <!--native调用原始事件-->
    <p><whl @click.native="add(5,$event)"></whl></p>
</div>
<button οnclick="app.add(9)">外部ADD</button>

</body>
</html>
<script>
    //声明一个组件
    var whl={
        template:`<button>组件ADD</button>`
    }
    var app = new Vue({
        el:'#app',
        data:{
            message:1
        },
        components:{
          'whl':whl
        },
        methods:{
            //event 参数  可以打印出来看看
            add:function(num,event){
               // console.log(event);
                if(num!=null){
                    this.message+=num
                }else{
                    this.message++
                }

            }
        }
    })
</script>