Vue学习案例：数据通信-子传父（自定义事件）

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- 父模板 -->
    <div id="app">
      <cpn @itme-click="cpnClick"></cpn>
    </div>

    <!-- 子模板 -->
    <template id="cpn">
      <div>
        <button v-for="itme in categories" @click="btnClick(itme)">
          {{itme.name}}
        </button>
      </div>
    </template>

    <script src="../vue.js"></script>
    <script>
      // 子组件
      const cpn = {
        template: "#cpn",
        data() {
          return {
            categories: [
              { id: "aaa", name: "热门推荐" },
              { id: "bbb", name: "家用家电" },
              { id: "ccc", name: "手机数码" },
            ],
          };
        },
        methods: {
          btnClick(itme) {
            // 发射事件：自定义事件(自定义事件名称，自定义事件的参数)
            this.$emit("itme-click", itme);
          },
        },
      };

      // 父组件
      const app = new Vue({
        el: "#app",
        components: {
          cpn,
        },
        methods: {
          cpnClick(itme) {
            console.log("cpnClick", itme);
          },
        },
      });
    </script>
  </body>
</html>