main.json

{
  "navigationStyle":"custom",
  "navigationBarTextStyle": "white",
  "usingComponents": {
    "van-button": "/static/vant/button/index",
    "van-icon": "/static/vant/icon/index",
    "van-popup": "/static/vant/popup/index",
    "van-stepper": "/static/vant/stepper/index"

  }
}