提交工程，小程序源码已完成，单片机待完成

wex_small/pages/index/index.json

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+{
+  "navigationStyle": "custom",
+  "usingComponents": {
+    "van-cell": "@vant/weapp/cell/index",
+    "van-cell-group": "@vant/weapp/cell-group/index",
+    "van-button": "@vant/weapp/button/index",
+    "van-tag": "@vant/weapp/tag/index",
+    "van-icon": "@vant/weapp/icon/index",
+    "van-divider": "@vant/weapp/divider/index",
+    "van-field": "@vant/weapp/field/index",
+    "van-popup": "@vant/weapp/popup/index",
+    "van-datetime-picker": "@vant/weapp/datetime-picker/index",
+    "van-stepper": "@vant/weapp/stepper/index",
+    "van-slider": "@vant/weapp/slider/index",
+    "van-toast": "@vant/weapp/toast/index",
+    "van-loading": "@vant/weapp/loading/index",
+    "van-overlay": "@vant/weapp/overlay/index",
+    "van-switch": "@vant/weapp/switch/index",
+    "van-picker": "@vant/weapp/picker/index",
+    "van-notice-bar": "@vant/weapp/notice-bar/index",
+    "van-grid": "@vant/weapp/grid/index",
+    "van-grid-item": "@vant/weapp/grid-item/index"
+  }
+}