new Vue({
  el: "#app",
  data: {
    title: "动态样式练习",
    isActive: false,
    progress: 35,
  },
  methods: {
    toggleCard() {
      // 任务：
      // 1. 切换 isActive
      this.isActive = !this.isActive
      // 2. 如果激活了，让 progress 增加到 80
      if (this.isActive) {
        this.progress = 80
      } else {
        this.progress = 35
      }
      // 3. 如果取消激活，让 progress 回到 35
    },
  },
});