docs(Form): use composition api

src/datetime-picker/README.md

@@ -32,7 +32,7 @@ app.use(DatetimePicker);
 import { ref } from 'vue';
 
 export default {
-  data() {
+  setup() {
     const currentDate = ref(new Date());
     return {
       minDate: new Date(2020, 0, 1),
@@ -60,7 +60,7 @@ export default {
 import { ref } from 'vue';
 
 export default {
-  data() {
+  setup() {
     const currentDate = ref(new Date());
 
     const formatter = (type, val) => {
@@ -99,7 +99,7 @@ export default {
 import { ref } from 'vue';
 
 export default {
-  data() {
+  setup() {
     const currentDate = ref(new Date());
 
     const formatter = (type, val) => {
@@ -137,7 +137,7 @@ export default {
 import { ref } from 'vue';
 
 export default {
-  data() {
+  setup() {
     const currentTime = ref('12:00');
     return { currentTime };
   },
@@ -160,7 +160,7 @@ export default {
 import { ref } from 'vue';
 
 export default {
-  data() {
+  setup() {
     const currentDate = ref(new Date());
     return {
       minDate: new Date(2020, 0, 1),
@@ -187,7 +187,7 @@ export default {
 import { ref } from 'vue';
 
 export default {
-  data() {
+  setup() {
     const currentDate = ref(new Date());
     return {
       minDate: new Date(2020, 0, 1),
@@ -213,7 +213,7 @@ export default {
 import { ref } from 'vue';
 
 export default {
-  data() {
+  setup() {
     const currentTime = ref('12:00');
 
     const filter = (type, options) => {