/** this is Parent.vue */ <template> <div> <div>{{'parent data : ' + parentData}}</div> <div>{{'parent to children1 props : ' + parentToChildren1Props}}</div> <div>{{'parent to children2 props : ' + parentToChildren2Props}}</div> <div> <el-button @click="changeParentData">change parent data</el-button> <el-button @click="changeParentToChildren1Props">change parent to children1 data</el-button> <el-button @click="changeParentToChildren2Props">change parent to children2 data</el-button> </div> <my-children1 :children1Props="parentToChildren1Props" @changeParentToChildren1Props="changeParentToChildren1Props"></my-children1> <my-children2 :children2Props="parentToChildren2Props" @changeParentToChildren2Props="changeParentToChildren2Props"></my-children2> </div> </template> <script> import Children1 from './Children1'; import Children2 from './Children2'; export default{ name: 'parent', data() { return { parentData: 'ParentData', parentToChildren1Props: 'ParentToChildren1Props', parentToChildren2Props: 'ParentToChildren2Props' } }, beforeCreate: function() { console.log('*******this is parent beforeCreate*********'); }, created: function() { console.log('######this is parent created######'); }, beforeMount: function() { console.log('------this is parent beforeMount------'); }, mounted: function() { console.log('++++++this is parent mounted++++++++'); }, beforeUpdate: function() { console.log('&&&&&&&&this is parent beforeUpdate&&&&&&&&'); }, updated: function() { console.log('$$$$$$$this is parent updated$$$$$$$$'); }, methods: { changeParentData: function() { this.parentData = 'changeParentData' }, changeParentToChildren1Props: function() { this.parentToChildren1Props = 'changeParentToChildren1Props' }, changeParentToChildren2Props: function() { this.parentToChildren2Props = 'changeParentToChildren2Props' } }, components: { 'my-children1': Children1, 'my-children2': Children2 } } </script>
/** this is Children1.vue */ <template> <div> <div>{{'children1 data : ' + children1Data}}</div> <div>{{'parent to children1 props : ' + children1Props}}</div> <div>{{'parent to children1 props to data : ' + children1PropsData}}</div> <div> <el-button @click.native="changeChildren1Data">change children1 data</el-button> <el-button @click.native="emitParentToChangeChildren1Props">emit parent to change children1 props</el-button> </div> </div> </template> <script> export default { name: 'children1', props: ['children1Props'], data() { return { children1Data: 'Children1Data' } }, computed: { children1PropsData: function() { return this.children1Props } }, beforeCreate: function() { console.log('*******this is children1 beforeCreate*********'); }, created: function() { console.log('######this is children1 created######'); }, beforeMount: function() { console.log('------this is children1 beforeMount------'); }, mounted: function() { console.log('++++++this is children1 mounted++++++++'); }, beforeUpdate: function() { console.log('&&&&&&&&this is children1 beforeUpdate&&&&&&&&'); }, updated: function() { console.log('$$$$$$$this is children1 updated$$$$$$$$'); }, methods: { changeChildren1Data: function() { this.children1Data = 'changeChildren1Data' }, emitParentToChangeChildren1Props: function() { console.log('emitParentToChangeChildren1Props'); this.$emit('changeParentToChildren1Props'); } } } </script>
/** this is Children2.vue */
<template>
<div>
<div>{{'children2 data : ' + children2Data}}</div>
<div>{{'parent to children2 props : ' + children2Props}}</div>
<div>{{'parent to children2 props to data : ' + children2PropsData}}</div>
<div>
<el-button @click.native="changeChildren2Data">change children2 data</el-button>
<el-button @click.native="emitParentToChangeChildren2Props">emit parent to change children2 props</el-button>
</div>
</div>
</template>
<script>
export default {
name: 'children2',
props: ['children2Props'],
data() {
return {
children2Data: 'Children2Data',
children2PropsData: this.children2Props
}
},
beforeCreate: function() {
console.log('*******this is children2 beforeCreate*********');
},
created: function() {
console.log('######this is children2 created######');
},
beforeMount: function() {
console.log('------this is children2 beforeMount------');
},
mounted: function() {
console.log('++++++this is children2 mounted++++++++');
},
beforeUpdate: function() {
console.log('&&&&&&&&this is children2 beforeUpdate&&&&&&&&');
},
updated: function() {
console.log('$$$$$$$this is children2 updated$$$$$$$$');
},
methods: {
changeChildren2Data: function() {
this.children2Data = 'changeChildren2Data'
},
emitParentToChangeChildren2Props: function() {
this.$emit('changeParentToChildren2Props');
}
}
}
</script>
父组件改变props，子组件如果直接使用props，会触发子组件更新
父组件改变props，子组件如果将props放进data中再使用，不会触发子组件更新
父组件改变props，子组件如果将props放进computed中再使用，会触发子组件更新
data，props和computed的变化都会触发组件更新