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

src/field/demo/FormatValue.vue

@@ -1,10 +1,17 @@
 <template>
   <demo-block v-if="!isWeapp" :title="t('formatValue')">
     <van-field
-      v-model="formatValue"
+      v-model="value1"
       :label="t('text')"
       :formatter="formatter"
-      :placeholder="t('formatValue')"
+      :placeholder="t('formatOnChange')"
+    />
+    <van-field
+      v-model="value2"
+      :label="t('text')"
+      :formatter="formatter"
+      format-trigger="onBlur"
+      :placeholder="t('formatOnBlur')"
     />
   </demo-block>
 </template>
@@ -15,16 +22,21 @@ export default {
     'zh-CN': {
       text: '文本',
       formatValue: '格式化输入内容',
+      formatOnBlur: '在失焦时执行格式化',
+      formatOnChange: '在输入时执行格式化',
     },
     'en-US': {
       text: 'Text',
       formatValue: 'Format Value',
+      formatOnBlur: 'Format On Blur',
+      formatOnChange: 'Format On Change',
     },
   },
 
   data() {
     return {
-      formatValue: '',
+      value1: '',
+      value2: '',
     };
   },