实例 Vue unmounted 生命周期钩子实例

<template>

  <h1>Lifecycle Hook 'unmounted' Example</h1>

  <button @click="this.activeComp = !this.activeComp">{{ btnText }}</button>

  <div>

    <comp-one v-if="activeComp"></comp-one>

  </div>

  <p><strong>Note: </strong>First, the component is removed from the DOM, then the alert is displayed, and then the browser renders the Vue application without the component.</p>

</template>

​

<script>

export default {

  data() {

    return {

      activeComp: true

    }

  },

  computed: {

    btnText() {

      if(this.activeComp) {

        return 'Remove component'

      }

      else {

        return 'Add component'

      }

    }

  }

}

</script>

​

<style scoped>

  div {

    border: dashed black 1px;

    border-radius: 10px;

    padding: 20px;

    margin: 10px;

    width: 400px;

    background-color: lightgreen;

  }

</style>