Bagaimana untuk menetapkan gaya dalam vue

<div id="box">
            <!--直接添加样式-->
            <p style="background-color: blue;">sssss</p>
            <!--绑定样式-->
            <p v-bind:style="&#39;background-color: red;&#39;">sssss</p>
            <!--将vue中的属性作为样式设置-->
            <p :style="obj">sssss</p>
            <!--将多个属性作为样式设置-->
            <p :style="[obj,obj1]">sssss</p>
        </div>
        <script type="text/javascript">
            var vm=new Vue({
                el:"#box",
                data:{
                    obj:{
                        backgroundColor:"gold"
                    },
                    obj1:{
                        fontSize: "30px"
                    }
                },
            });
        </script>