feat(Field): add format-trigger prop (#6566)

src/field/test/__snapshots__/demo.spec.js.snap

@@ -112,7 +112,13 @@ exports[`renders demo correctly 1`] = `
     <div class="van-cell van-field">
       <div class="van-cell__title van-field__label"><span>文本</span></div>
       <div class="van-cell__value van-field__value">
-        <div class="van-field__body"><input type="text" placeholder="格式化输入内容" class="van-field__control"></div>
+        <div class="van-field__body"><input type="text" placeholder="在输入时执行格式化" class="van-field__control"></div>
+      </div>
+    </div>
+    <div class="van-cell van-field">
+      <div class="van-cell__title van-field__label"><span>文本</span></div>
+      <div class="van-cell__value van-field__value">
+        <div class="van-field__body"><input type="text" placeholder="在失焦时执行格式化" class="van-field__control"></div>
       </div>
     </div>
   </div>

src/field/test/index.spec.js

@@ -297,6 +297,29 @@ test('formatter prop', () => {
   expect(wrapper.emitted('input')[1][0]).toEqual('efg');
 });
 
+test('format-trigger prop', () => {
+  const wrapper = mount(Field, {
+    propsData: {
+      value: 'abc123',
+      formatTrigger: 'onBlur',
+      formatter: (value) => value.replace(/\d/g, ''),
+    },
+  });
+
+  wrapper.vm.$on('input', (value) => {
+    wrapper.setProps({ value });
+  });
+
+  expect(wrapper.emitted('input')[0][0]).toEqual('abc');
+
+  const input = wrapper.find('input');
+  input.element.value = '123efg';
+  input.trigger('input');
+  expect(wrapper.emitted('input')[1][0]).toEqual('123efg');
+  input.trigger('blur');
+  expect(wrapper.emitted('input')[2][0]).toEqual('efg');
+});
+
 test('reach max word-limit', () => {
   const wrapper = mount(Field, {
     propsData: {