VUE3（三）v-bind和v-on

v-bind绑定style的数组语法：

    <template id="my-app">
        <div :style="[style1Obj, style2Obj]">哈哈哈</div>
    </template>
    <script src="../js/vue.js"></script>
    <script>
        const app={
            template:"#my-app",
            data(){
                return{
                    style1Obj: {
                        color: 'red',
                        fontSize: '30px'
                    },
                    style2Obj: {
                        textDecoration: "underline"
                    }
                }
            },
            methods:{
            }
        };