快速了解Vue父子组件传值以及父调子方法、子调父方法

<template>
 <div>
  <p class="father">父组件</p>
  <child :sid="id"></child>
 </div>
</template>

<script>
import child from './child'
export default {
 components: {
  child
 },
 data() {
  return {
   id:'0920', // 父组件向子组件传的值
  }
 },
}
</script>

<template>
 <div>
  <p class="child">子组件</p>
  <p class="child">接收父组件的值是：{{sid}}</p>
 </div>
</template>

<script>
export default {
 props:{
  sid:{
   type:String,
   default: '0'
  }
 },
 data() {
  return {
  }
 }
}
</script>

<template>
 <div>
  <p class="father">父组件</p>
　　　 <p class="father">接收到子组件的值：{{childSia}}</p>
  <child @passVaule="passValue"></child>
 </div>
</template>

<script>
import child from './child'
export default {
 components: {
  child
 },
 data() {
  return {
   childSia:'', // 接收子组件的值
  }
 },
 methods: {
  passValue(data) {
   this.childSia = data;
  }
 }
}
</script>

<template>
 <div>
  <p class="child">子组件</p>
  <button @click="valueClick">传值</button>
 </div>
</template>

<script>
export default {
 data() {
  return {
  }
 },
 methods: {
  valueClick() {
   this.$emit('passVaule',19)
  }
 }
}
</script>

<template>
 <div>
  <p class="father">父组件</p>
  <child @funVaule="funValue"></child>
 </div>
</template>

<script>
import child from './child'
export default {
 components: {
  child
 },
 data() {
  return {
  }
 },
 methods: {
  funValue() {
   console.log('调用了父组件中的函数');
  }
 }
}
</script>

<template>
 <div>
  <p class="child">子组件</p>
  <button @click="funClick">调用父组件方法</button>
 </div>
</template>

<script>
export default {
 data() {
  return {
  }
 },
 methods: {
  funClick() {
   this.$emit('funVaule')
  }
 }
}
</script>

<template>
 <div>
  <p class="father">父组件</p>
  <button @click="childClick">调用子组件方法</button>
  <child ref="mychild" ></child>
 </div>
</template>

<script>
import child from './child'
export default {
 components: {
  child
 },
 data() {
  return {
  }
 },
 methods: {
  childClick() {
   this.$refs.mychild.testNum(9809)
  }
 }
}
</script>

<template>
 <div>
  <p class="child">子组件</p>
</button>
 </div>
</template>

<script>
export default {
 data() {
  return {
  }
 },
 methods: {
  testNum(e) {
   console.log('调用了子组件中的方法 11111',e)
  }
 }
}
</script>