fix: now表达式作为form组件默认值时，增加特殊逻辑，处理数据更新 (#5783)

packages/amis-core/src/renderers/wrapControl.tsx

@@ -18,7 +18,8 @@ import {
   isNeedFormula,
   isExpression,
   FormulaExec,
-  replaceExpression
+  replaceExpression,
+  isNowFormula
 } from '../utils/formula';
 import {IIRendererStore, IRendererStore} from '../store';
 import {ScopedContext, IScopedContext} from '../Scoped';
@@ -362,11 +363,17 @@ export function wrapControl<
               typeof props.defaultValue !== 'undefined' &&
               isExpression(props.defaultValue)
             ) {
+              const nowFormulaChecked = isNowFormula(props.defaultValue);
               // 渲染器中的 defaultValue 优先（备注: SchemaRenderer中会将 value 改成 defaultValue）
               if (
                 !isEqual(props.defaultValue, prevProps.defaultValue) ||
                 (props.data !== prevProps.data &&
-                  isNeedFormula(props.defaultValue, props.data, prevProps.data))
+                  (isNeedFormula(
+                    props.defaultValue,
+                    props.data,
+                    prevProps.data
+                  ) ||
+                    nowFormulaChecked))
               ) {
                 const curResult = FormulaExec['formula'](
                   props.defaultValue,
@@ -385,6 +392,13 @@ export function wrapControl<
                   if (props.onChange) {
                     props.onChange(curResult, model.name, false);
                   }
+                } else if (nowFormulaChecked) {
+                  const nowData = props.data[model.name];
+                  // now 表达式，计算后的值永远相同
+                  model.changeTmpValue(nowData);
+                  if (props.onChange) {
+                    props.onChange(nowData, model.name, false);
+                  }
                 }
               }
             } else if (model) {

packages/amis-core/src/utils/formula.ts

@@ -238,6 +238,11 @@ export function isNeedFormula(
   }
 }
 
+export function isNowFormula(expression: string): boolean {
+  const block = expression.split(/\${|\||}/).filter(item => item);
+  return block[1] === 'now';
+}
+
 // 将 \${xx} 替换成 ${xx}
 export function replaceExpression(expression: any): any {
   if (

packages/amis/__tests__/renderers/Date.test.tsx

@@ -1,9 +1,10 @@
 import React = require('react');
-import {render} from '@testing-library/react';
+import {render, fireEvent} from '@testing-library/react';
 import '../../src';
 import {render as amisRender} from '../../src';
 import {makeEnv} from '../helper';
 import moment from 'moment';
+import {act} from 'react-test-renderer';
 
 test('Renderer:date', async () => {
   const {container} = render(
@@ -31,3 +32,60 @@ test('Renderer:date', async () => {
 
   expect(container).toMatchSnapshot();
 });
+
+test('Renderer:date reset', async () => {
+  const {container, getByText} = render(
+    amisRender(
+      {
+        type: 'form',
+        title: '表单',
+        body: [
+          {
+            label:
+              '本月第一天$ {_|now|dateModify:startOf:month|date:YYYY-MM-DD}',
+            type: 'input-date',
+            name: 'month',
+            value: '${_|now|dateModify:startOf:month|date:YYYY-MM-DD}',
+            minDate: '',
+            maxDate: '',
+            format: 'YYYY-MM-DD',
+            inputFormat: 'YYYY-MM-DD',
+            valueFormat: 'YYYY-MM-DD'
+          },
+          {
+            type: 'reset',
+            label: '重置',
+            actionType: 'reset',
+            dialog: {
+              title: '系统提示',
+              body: '对你点击了'
+            },
+            id: 'u:862532a9f698',
+            level: 'dark'
+          }
+        ],
+        id: 'u:7c281facfdbb'
+      },
+      {},
+      makeEnv({})
+    )
+  );
+
+  const inputElement = container.querySelector('input[type="text"]') as any;
+
+  const defaultValue = inputElement?.value;
+  // 打开日期选择器
+  fireEvent.click(inputElement);
+  // 更换月份
+  fireEvent.click(container.querySelector('[icon="right-arrow"]')!);
+  // 选择一个新的日期
+  fireEvent.click(container.querySelector('td[data-value="1"]')!);
+  // 新选的日期与旧的不同
+  expect(inputElement?.value !== defaultValue).toBeTruthy();
+  // 点击重制
+  await act(() => {
+    fireEvent.click(container.querySelector('button[type="reset"]')!);
+  });
+  // 重制后的日期 等于初始化的日期
+  expect(inputElement?.value === defaultValue).toBeTruthy();
+});