<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="app">
        <h2>{{title}}</h2>
        <button @click="randomTitle">改变Title</button>
        <button @click="destroyVm">销毁实例</button>
    </div>

    <script src="../js/vue.js"></script>

    <script>
        let vm = new Vue({
            el:'#app',
            data(){
               return {
                   title:'Hello'
               }
            },
            methods:{
                randomTitle:function () {
                    this.title = 'Hello ' + ['China','World','Universe'][Math.floor(Math.random() * 2.999)];
                },
                destroyVm(){
                    this.$destroy();
                }
            },
            beforeCreate(){
                console.log('before create');
            },
            created(){
                console.log('created');
            },
            beforeMount(){
                console.log('before mount');
            },
            mounted(){
                console.log('mounted');
            },
            beforeUpdate(){
                console.log('before update');
            },
            updated(){
                console.log('updated');
            },
            beforeDestroy(){
                console.log('before destroy');
            },
            destroyed(){
                console.log('destroyed');
            }

        });
    </script>
</body>
</html>