vue组件传值的实现方式小结【三种方式】

<template>
  <div id="container">
    {{msg}}
  </div>
</template>
<script>
export default {
 data() {
  return {};
 },
 props:{
  msg: String
 }
};
</script>
<style scoped>
#container{
  color: red;
  margin-top: 50px;
}
</style>

<template>
  <div id="container">
    <input type="text" v-model="text" @change="dataChange">
    <Child :msg="text"></Child>
  </div>
</template>
<script>
import Child from "@/components/Child";
export default {
 data() {
  return {
   text: "父组件的值"
  };
 },
 methods: {
  dataChange(data){
    this.msg = data
  }
 },
 components: {
  Child
 }
};
</script>
<style scoped>
</style>

<template>
  <div id="container">
    <input type="text" v-model="msg">
    <button @click="setData">传递到父组件</button>
  </div>
</template>
<script>
export default {
 data() {
  return {
   msg: "传递给父组件的值"
  };
 },
 methods: {
  setData() {
   this.$emit("getData", this.msg);
  }
 }
};
</script>
<style scoped>
#container {
 color: red;
 margin-top: 50px;
}
</style>

<template>
  <div id="container">
    <Child @getData="getData"></Child>
    <p>{{msg}}</p>
  </div>
</template>
<script>
import Child from "@/components/Child";
export default {
 data() {
  return {
   msg: "父组件默认值"
  };
 },
 methods: {
  getData(data) {
   this.msg = data;
  }
 },
 components: {
  Child
 }
};
</script>
<style scoped>
</style>