Vue3 生命周期新写法

介绍

在Vue3中生命周期有了新的写法，下面来看看吧

效果

我们可以看到声明周期函数都被调用了

在这里插入图片描述

代码

// beforeMount => onBeforeMount
// mounted => onMounted
// beforeUpdate => onBeforeUpdate
// beforeUnmount => onBeforeUnmount
// unmouted => onUnmounted

DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>lesson 40title>
  <script src="https://unpkg.com/vue@next">script>
head>
<body>
  <div id="root">div>
body>
<script>

  const app = Vue.createApp({
    // beforeMount => onBeforeMount
    // mounted => onMounted
    // beforeUpdate => onBeforeUpdate
    // beforeUnmount => onBeforeUnmount
    // unmouted => onUnmounted
    setup() {
      const {
        ref, onBeforeMount, onMounted, onBeforeUpdate, onUpdated,
        onRenderTracked, onRenderTriggered
      } = Vue;
      const name = ref('dell')
      onBeforeMount(() => {
        console.log('onBeforeMount')
      })
      onMounted(() => {
        console.log('onMounted')
      })
      onBeforeUpdate(() => {
        console.log('onBeforeUpdate')
      })
      onUpdated(() => {
        console.log('onUpdated')
      })
      // 每次渲染后重新收集响应式依赖
      onRenderTracked(() => {
        console.log('onRenderTracked')
      })
      // 每次触发页面重新渲染时自动执行
      onRenderTriggered(() => {
        console.log('onRenderTriggered')
      })
      const handleClick = () => {
        name.value = 'lee'
      }
      return { name, handleClick }
    },
    template: `
      
        {{name}}
      
    `,
  });
  
  const vm = app.mount('#root');
script>
html>

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原文地址：https://blog.csdn.net/weixin_41405524/article/details/126354490