微信小程序getLocation 需要在app.json中声明permission字段

"permission": {
  "scope.userLocation": {
   "desc": "你的位置信息将用于小程序位置接口的效果展示"
  }
 }

{
 "pages": [
  "pages/index/index",
  "pages/home/home",
  "pages/logs/logs",
  "pages/test/test"
 ],
 "window": {
  "backgroundTextStyle": "light",
  "navigationBarBackgroundColor": "#405f80",
  "navigationBarTitleText": "这是标题",
  "navigationBarTextStyle": "black",
  "enablePullDownRefresh ": "true"
 },
 "tabBar": {
  "borderStyle": "white",
  "position": "bottom",
  "list": [
   {
    "pagePath": "pages/home/home",
    "text": "首页",
    "iconPath": "images/tab/paidui.png",
    "selectedIconPath": "images/tab/paidui1.png"
   },
   {
    "pagePath": "pages/test/test",
    "text": "记录",
    "iconPath": "images/tab/jilu.png",
    "selectedIconPath": "images/tab/jilu2.png"
   }
  ]
 },
 "permission": {
  "scope.userLocation": {
   "desc": "你的位置信息将用于小程序位置接口的效果展示"
  }
 }
}