Vue3的生命周期函数
| 选项式 API | 组合式API |
| beforeCreate | 不需要 |
| created | 不需要 |
| beforeMount | onBeforeMount |
| mounted | onMounted |
| beforeUpdate | onBeforeUpdate |
| updated | onUpdated |
| beforeUnmount 【vue2.x中的beforeDestory】 | onBeforeUnmount |
| unmounted 【vue2.x中的destoryed】 | onUnmounted |
| activated | onActivated |
| deactivated | onDeactivated |
