Vue2.js迁移到Vue3.js的API变化，-表示移除
Vue2.jsVue3.jsnew Vue()createApp()Vue.extenddefineComponent or extendsVue.prototypeapp.config.globalPropertiesVue.set-Vue.delete-Vue.observablereactiveconfig.keyCodes-vm.$set-vm.$delete-vm.$on-vm.$off-vm.$once-vm.$children-vm.$listeners-hook:x-vm.$scopedSlots-vm.$slotsnow exposes functions$attrsnow includes class and styledatamust be a function in all casesdatafrom mixin or extension is now shallow mergedbeforeDestroybeforeUnmountdestroyedunmountedv-onno longer supports keyCode modifiers-watching an array no longer triggers on mutation unless deep-Custom directive hook names changed-No longer removes attribute if binding value is boolean false-No longer special case enumerated attributes
no longer renders a root element by default-Async component API changed (now requires defineAsyncComponent)-Functional component API changed (now must be plain functions)-Component v-model reworked-Render function API changed-Filters removed (this option affects only runtime filter APIs)-is usage is now restricted to
onlyv-bind.syncreplaced by v-model with argumentsv-bind.propmodifier removedv-bind=“object”is now order sensitivev-on.nativemodifier removed-ref in v-for (compiler support)
with no special directives now renders as native element-filters (compiler support)
参考 https://v3-migration.vuejs.org/migration-build.html#fully-compatible
