Vue - 生命周期
一:生命周期图
1.官网原图
3.我理解的图
二:生命周期
create
let vm = new Vue()
mount
挂载,把div挂载到组件中
update
let vm = new Vue({
el: '#box',
data: {
isShow: true // 修改这个内容
},
methods: {
handleClick() {
console.log('我是根组件')
}
}
})
1.bedoreCreate
2.created
3.beforeMount
4.mounted(用得最多)
这时候可以向后端发送数据了
5.beforeUpdate
6.updated
7.beforeDestroy
8.destroyed
组件销毁 - 给组件写一个定时器
setTimeout() // 延迟3s干什么事
setInterval() // 延迟3s干什么事
测试代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>生命周期</title>
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.12/vue.min.js"></script>
</head>
<body>
<div id="box">
<child v-if="isShow"></child>
<br>
<button @click="terminate">删除子组件</button>
<button @click="reborn">显示子组件</button>
</div>
</body>
<script>
Vue.component('child', {
template: `
<div>
{{name}}
<button @click="name='Darker1'">更新数据1</button>
<button @click="name='Darker2'">更新数据2</button>
</div>`,
data() {
return {
name: 'Darker1',
}
},
beforeCreate() {
console.group('当前状态:beforeCreate')
console.log('当前el状态:', this.$el)
console.log('当前data状态:', this.$data)
console.log('当前name状态:', this.name)
},
created() {
console.group('当前状态:created')
console.log('当前el状态:', this.$el)
console.log('当前data状态:', this.$data)
console.log('当前name状态:', this.name)
},
beforeMount() {
console.group('当前状态:beforeMount')
console.log('当前el状态:', this.$el)
console.log('当前data状态:', this.$data)
console.log('当前name状态:', this.name)
},
mounted() {
console.group('当前状态:mounted')
console.log('当前el状态:', this.$el)
console.log('当前data状态:', this.$data)
console.log('当前name状态:', this.name)
},
beforeUpdate() {
console.group('当前状态:beforeUpdate')
console.log('当前el状态:', this.$el)
console.log('当前data状态:', this.$data)
console.log('当前name状态:', this.name)
},
updated() {
console.group('当前状态:updated')
console.log('当前el状态:', this.$el)
console.log('当前data状态:', this.$data)
console.log('当前name状态:', this.name)
},
beforeDestroy() {
console.group('当前状态:beforeDestroy')
console.log('当前el状态:', this.$el)
console.log('当前data状态:', this.$data)
console.log('当前name状态:', this.name)
},
destroyed() {
console.group('当前状态:destroyed')
console.log('当前el状态:', this.$el)
console.log('当前data状态:', this.$data)
console.log('当前name状态:', this.name)
},
})
let vm = new Vue({
el: '#box',
data: {
isShow: true
},
methods: {
terminate() {
this.isShow = false
},
reborn() {
this.isShow = true
}
}
})
</script>
</html>