new Vue({
  el: "#app",
  data: {
    isPaid: false,
    showList: true,
    courses: [
      { id: 1, title: "Vue 实例", status: "已完成" },
      { id: 2, title: "指令系统", status: "学习中" },
      { id: 3, title: "组件通信", status: "未开始" },
    ],
  },
});