vue.js父子组件传参的原理与实现方法 原创

<!-- Counter.vue -->
<template>
  <div class="counter">
    <h4>{{ title }}</h4>
    <p>当前计数：{{ count }}</p>
    <button @click="addCount">+1</button>
    <button @click="reduceCount">-1</button>
  </div>
</template>

<script>
export default {
  name: "Counter",
  props: {
    title: {
      type: String,
      required: true,
    },
    count: {
      type: Number,
      required: true,
    },
  },
  methods: {
    // 添加计数
    addCount() {
      this.$emit("add-count");
    },
    // 减少计数
    reduceCount() {
      this.$emit("reduce-count");
    },
  },
};
</script>

<!-- App.vue -->
<template>
  <div class="container">
    <h2>计数器应用</h2>
    <hr />
    <!-- 父组件传递计数器标题和当前计数给子组件 -->
    <Counter :title="title" :count="count" @add-count="handleAddCount" @reduce-count="handleReduceCount" />
  </div>
</template>

<script>
import Counter from "./components/Counter.vue";

export default {
  name: "App",
  components: {
    Counter,
  },
  data() {
    return {
      title: "计数器",
      count: 0,
    };
  },
  methods: {
    // 添加计数
    handleAddCount() {
      this.count++;
    },
    // 减少计数
    handleReduceCount() {
      this.count--;
    },
  },
};
</script>