What are the common knowledge points in Vue3.x project development?

This article mainly introduces "what are the common knowledge points of Vue3.x project development". In the daily operation, I believe that many people have doubts about the common knowledge points of Vue3.x project development. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts of "what are the common knowledge points of Vue3.x project development?" Next, please follow the editor to study!

PS: the following knowledge points are based on vue3.x + typescript + element-plus + setup syntax sugar.

First, define the component attribute const props = defineProps ({visible: {type: Boolean, default: false}}) console.log (props.visible) [warning] Note: defineProps does not need to be introduced from vue, setup syntax sugar environment will automatically recognize the second, formatter acronym

Use formatter shorthand in el-table-column

3. Communication between child and parent components

Subcomponents:

Const props = defineProps ({visible: {type: Boolean, default: false}}) const emit = defineEmits (['closeILdialog']) / / register trigger, defineEmits does not need to be introduced from vue, setup syntax sugar environment will automatically recognize function onDialogClose () {emit (' closeILdialog') / / trigger}

Parent component:

Let ILdialog = reactive ({visible: false}) function closeILdialog () {ILdialog.visible = false} IV. Listener component attribute change const props = defineProps ({visible: {type: Boolean, default: false}) / / listener visiblewatch (() = > props.visible, (newV) = > {if (newV) {/ /.}}) 5. Custom instruction

Local instruction:

Const vFoo = {mounted (el: any, binding: any) {console.log (binding.value) / / 123}} [warning] Note: the local instruction definition needs to start with v, such as vFoo, in order to recognize the v-foo instruction.

Global directive:

Const app = createApp (App) / / permission instruction app.directive ('auth', {mounted (el: any, binding: any) {if (! binding.value) {el [XSS _ clean] .removeChild (el)}), the study on "what are the common knowledge points of Vue3.x project development" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!