vue3与vue2中mouted actived怎么写?
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vue3要想使用onMounted函数,必须import一下,代码如下:
import { onMounted, onUpdated, onUnmounted } from 'vue'
除了 beforeCreate 和 created 之外,在我们的Vue3的 setup 方法中,有9个旧的生命周期钩子,我们可以在setup 方法中访问 onBeforeMount onMounted onBeforeUpdate onUpdated onBeforeUnmount onUnmounted onActivated onDeactivated onErrorCaptured
我们导入它们并在我们的代码中访问它们
import { onBeforeMount, onMounted, onBeforeUpdate, onUpdated, onBeforeUnmount, onUnmounted, onActivated, onDeactivated, onErrorCaptured } from 'vue' export default { setup() { onBeforeMount(() => { // ... }) onMounted(() => { // ... }) onBeforeUpdate(() => { // ... }) onUpdated(() => { // ... }) onBeforeUnmount(() => { // ... }) onUnmounted(() => { // ... }) onActivated(() => { // ... }) onDeactivated(() => { // ... }) onErrorCaptured(() => { // ... }) } }从Vue2转换到Vue3钩子函数的变化
beforeCreate -> use setup() created -> use setup() beforeMount -> onBeforeMount mounted -> onMounted beforeUpdate -> onBeforeUpdate updated -> onUpdated beforeDestroy -> onBeforeUnmount destroyed -> onUnmounted errorCaptured -> onErrorCaptured
新的调试钩子函数
们还可以在Vue3中使用两个全新的钩子函数来进行调试。他们是: onRenderTracked
onRenderTriggered
这两个事件都带有一个DebuggerEvent,它使我们能够知道是什么导致了Vue实例中的重新渲染。
export default { onRenderTriggered(e) { debugger // 检查哪个依赖项导致组件重新呈现 } }