nsgk_wechat/pages/contract/add/add.json

{
  "navigationStyle": "custom",
  "usingComponents": {
    "van-field": "@vant/weapp/field/index",
    "van-popup": "@vant/weapp/popup/index",
    "van-picker": "@vant/weapp/picker/index",
    "van-calendar": "@vant/weapp/calendar/index"
  }
}