vue3的新写法和特性整理——二、生命周期函数的变化

1、弃用钩子“beforeDestroy”、“destroyed”
ESlint检查

2、钩子的变化

<template>
  <div>
  </div>
</template>

<script>
export default {
  setup() {
    console.log('setup');
  },
  beforeCreate() {
    console.log('beforeCreate');
  },
  created() {
    console.log('created');
  },
  beforeMount() {
    console.log('beforeMount');
  },
  mounted() {
    console.log('mounted');
  },
  beforeUnmount() {
    console.log('beforeUnmount');
  },
  unmounted() {
    console.log('unmounted');
  },
  activated() {
    console.log('activated');
  },

  data() {
    return {
      initData: 'hello 你好'
    };
  },
};
</script>

　　

 生命周期顺序

注意:vue3中的生命周期函数，可以按需导入到组件中，且只能在 setup() 函数中使用

<script>
import { onMounted, onUpdated, onUnmounted } from 'vue';

export default {
  setup() {
    onMounted(() => {
      console.log('mounted!');
    });
    onUpdated(() => {
      console.log('updated!');
    });
    onUnmounted(() => {
      console.log('unmounted!');
    });
    return {};
  }
};
</script>