Vue学习笔记69--activated + deactivated

activated + deactivated

注：生命周期学习可参考学习笔记33

两个新的生命周期钩子

1. 作用：路由组件所独有的两个构造，用于捕获路由组件的激活状态
2. 具体名称：activated--路由组件被激活时触发 + deactivated--路由组件失活时触发

 示例如下所示：

<template>
  <div>
    <h3>News page</h3>
    <li :style="{opacity}">欢迎学习vue</li>
    <li>News 001<input type="text"></li>
    <li>News 002<input type="text"></li>
    <li>News 003<input type="text"></li>
  </div>
</template>
</template>

<script>
export default {
  name: 'News',
  data () {
    return {
      opacity: 1,
    }
  },
  /* 
  挂载
   mounted () {
     this.timer = setInterval(() => {
       this.opacity -= 0.01
       if (this.opacity <= 0) this.opacity = 1
     })
   },
   将要销毁
   beforeDestroy () {
     console.log('news组件即将被销毁了')
     clearInterval(this.timer)
   } */

  //  激活
  activated () {
    this.timer = setInterval(() => {
      console.log('news组件激活了')
      this.opacity -= 0.01
      if (this.opacity <= 0) this.opacity = 1
    })
  },
  // 失活
  deactivated () {
    console.log('news组件失活了')
    clearInterval(this.timer)
  },
}
</script>

<style>
</style>