new Vue({
  el: "#app",
  data: {
    title: "Vue2 基础入门",
    lessonCount: 8,
    learnerCount: 12,
  },
  methods: {
    increaseLearner() {
      this.learnerCount += 1;
      console.log("当前学习人数：", this.learnerCount);
    },
  },
});