breaking change(Picker): update values param

docs/markdown/migrate-from-v2.zh-CN.md

@@ -133,3 +133,7 @@ export default {
   },
 };
 ```
+
+### Picker 参数调整
+
+在 Picker 的级联选择下，confirm/change 事件返回的回调参数将包含为完整的选项对象。

src/picker/demo/index.vue

@@ -34,8 +34,6 @@
         show-toolbar
         :title="t('title')"
         :columns="t('cascadeColumns')"
-        @cancel="onCancel"
-        @confirm="onConfirm"
       />
     </demo-block>
 

src/picker/index.js

@@ -110,16 +110,7 @@ export default createComponent({
       if (this.dataType === 'text') {
         this.$emit(event, this.getColumnValue(0), this.getColumnIndex(0));
       } else {
-        let values = this.getValues();
-
-        // compatible with old version of wrong parameters
-        // should be removed in next major version
-        // see: https://github.com/youzan/vant/issues/5905
-        if (this.dataType === 'cascade') {
-          values = values.map((item) => item[this.valueKey]);
-        }
-
-        this.$emit(event, values, this.getIndexes());
+        this.$emit(event, this.getValues(), this.getIndexes());
       }
     },
 
@@ -151,16 +142,7 @@ export default createComponent({
           this.getColumnIndex(0)
         );
       } else {
-        let values = this.getValues();
-
-        // compatible with old version of wrong parameters
-        // should be removed in next major version
-        // see: https://github.com/youzan/vant/issues/5905
-        if (this.dataType === 'cascade') {
-          values = values.map((item) => item[this.valueKey]);
-        }
-
-        this.$emit('change', this, values, columnIndex);
+        this.$emit('change', this, this.getValues(), columnIndex);
       }
     },