Vue3新特性
- ES5：defineProperty：劫持----> ES6：Proxy：拦截(解决之前监听数组的漏洞)
- 包体积更小（按需打包）
- 虚拟dom
- TypeScript
- 生命周期
- Fragment、Teleport、Suspense
vue3的生命周期
| vue2.x | vue3.x |
|---|---|
| beforeCreated | Not needed* |
created |
Not needed* |
beforeMount |
onBeforeMount |
mounted |
onMounted |
beforeUpdate |
onBeforeUpdate |
updated |
onUpdated |
beforeUnmount |
onBeforeUnmount |
unmounted |
onUnmounted |
errorCaptured |
onErrorCaptured |
renderTracked |
onRenderTracked |
renderTriggered |
onRenderTriggered |
activated |
onActivated |
deactivated |
onDeactivated |