「后端小伙伴来学前端了」Vue中自定义事件讲解及组件绑定自定义事件实现通信

<!-- 方法处理器 -->
<button v-on:click="doThis"></button>
<!-- 动态事件 (2.6.0+) -->
<button v-on:[event]="doThis"></button>
<!-- 内联语句 -->
<button v-on:click="doThat('hello', $event)"></button>
<!-- 缩写 -->
<button @click="doThis"></button>
<!-- 动态事件缩写 (2.6.0+) -->
<button @[event]="doThis"></button>
<!-- 停止冒泡 -->
<button @click.stop="doThis"></button>
<!-- 阻止默认行为 -->
<button @click.prevent="doThis"></button>
<!-- 阻止默认行为，没有表达式 -->
<form @submit.prevent></form>
<!--  串联修饰符 -->
<button @click.stop.prevent="doThis"></button>
<!-- 键修饰符，键别名 -->
<input @keyup.enter="onEnter">
<!-- 键修饰符，键代码 -->
<input @keyup.13="onEnter">
<!-- 点击回调只会触发一次 -->
<button v-on:click.once="doThis"></button>
<!-- 对象语法 (2.4.0+) -->
<button v-on="{ mousedown: doThis, mouseup: doThat }"></button>

<my-component @my-event="handleThis"></my-component>
<!-- 内联语句 -->
<my-component @my-event="handleThis(123, $event)"></my-component>
<!-- 组件中的原生事件 -->
<my-component @click.native="onClick"></my-component>

<template>
  <div id="app">
    <!-- props方法传递 -->
    <Demo :showMsg="showMsg"></Demo>
    <!--绑定自定义事件 send-message:是我们自定义事件名， 后面的sendMessage自定义事件被触发执行的回调函数 -->
    <Demo1 v-on:send-message="sendMessage"></Demo1>
  </div>
</template>
<script>
import Demo from "./components/Demo.vue";
import Demo1 from "./components/Demo1.vue";
export default {
  name: "App",
  components: {
    Demo,
    Demo1,
  },
  methods: {
    showMsg() {
      alert("收到来自demo的信息");
    },
    sendMessage(value) {
      alert("sendMessage自定义事件被触发拉！！！收到来自demo2的信息:" + value);
    },
  },
};
</script>
<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

<template>
  <div class="demo">
    <h1>Demo</h1>
    <p>{{ msg }}</p>
    <button type="button" @click="sendMsg">点击发送消息给App组件</button>
  </div>
</template>
<script>
export default {
  props: {
    showMsg: Function,
  },
  data() {
    return {
      msg: "hello,大家好,我是宁在春",
    };
  },
  methods: {
    sendMsg() {
      this.showMsg();
    },
  },
};
</script>
<style>
.demo {
  width: 200px;
  height: 200px;
  background-color: #1488f5;
}
</style>

<template>
  <div class="demo1">
    <h1>Demo2</h1>
    <span>{{ msg }}</span>
    <button @click="sendAppMsg(msg)" type="button">
      点击发送消息给App组件
    </button>
  </div>
</template>
<script>
export default {
  data() {
    return {
      msg: "大家好，我是来自Demo2的宁在春",
    };
  },
  methods: {
    sendAppMsg(message) {
      this.$emit("send-message", message);
    },
  },
};
</script>
<style>
.demo1 {
  width: 200px;
  height: 200px;
  background-color: pink;
}
</style>