微信小程序实现授权登录

 <view wx:if="{{canIUse}}">
 <view class='header'>
  <image src='/images/wx_login.png'></image>
 </view>
 
 <view class='content'>
  <view>申请获取以下权限</view>
  <text>获得你的公开信息(昵称，头像等)</text>
 </view>
 
 <button class='bottom' type='primary' open-type="getUserInfo" lang="zh_CN" bindgetuserinfo="bindGetUserInfo">
  授权登录
 </button>
</view>
 
<view wx:else>请升级微信版本</view>

.header {
 margin: 90rpx 0 90rpx 50rpx;
 border-bottom: 1px solid #ccc;
 text-align: center;
 width: 650rpx;
 height: 300rpx;
 line-height: 450rpx;
}
 
.header image {
 width: 200rpx;
 height: 200rpx;
}
 
.content {
 margin-left: 50rpx;
 margin-bottom: 90rpx;
}
 
.content text {
 display: block;
 color: #9d9d9d;
 margin-top: 40rpx;
}
 
.bottom {
 border-radius: 80rpx;
 margin: 70rpx 50rpx;
 font-size: 35rpx;
}

{
 
"navigationBarTitleText": "授权登录"
 
}

 Page({
 data: {
  //判断小程序的API，回调，参数，组件等是否在当前版本可用。
  canIUse: wx.canIUse('button.open-type.getUserInfo')
 },
 onLoad: function () {
  var that = this;
  // 查看是否授权
  wx.getSetting({
   success: function (res) {
    if (res.authSetting['scope.userInfo']) {
     wx.getUserInfo({
      success: function (res) {
       //从数据库获取用户信息
       that.queryUsreInfo();
       //用户已经授权过
       wx.switchTab({
        url: ''
       })
      }
     });
    }
   }
  })
 },
 bindGetUserInfo: function (e) {
  if (e.detail.userInfo) {
   //用户按了允许授权按钮
   var that = this;
   //插入登录的用户的相关信息到数据库
   wx.request({
    url: getApp().globalData.urlPath + 'hstc_interface/insert_user',
    data: {
     openid: getApp().globalData.openid,
     nickName: e.detail.userInfo.nickName,
     avatarUrl: e.detail.userInfo.avatarUrl,
     province:e.detail.userInfo.province,
     city: e.detail.userInfo.city
    },
    header: {
     'content-type': 'application/json'
    },
    success: function (res) {
     //从数据库获取用户信息
     that.queryUsreInfo();
     console.log("插入小程序登录用户信息成功！");
    }
   });
   //授权成功后，跳转进入小程序首页
   wx.switchTab({
    url: '' 
   })
  } else {
   //用户按了拒绝按钮
   wx.showModal({
    title:'警告',
    content:'您点击了拒绝授权，将无法进入小程序，请授权之后再进入!!!',
    showCancel:false,
    confirmText:'返回授权',
    success:function(res){
     if (res.confirm) {
      console.log('用户点击了“返回授权”')
     } 
    }
   })
  }
 },
 //获取用户信息接口
 queryUsreInfo: function () {
  wx.request({
   url: getApp().globalData.urlPath + 'hstc_interface/queryByOpenid',
   data: {
    openid: getApp().globalData.openid
   },
   header: {
    'content-type': 'application/json'
   },
   success: function (res) {
    console.log(res.data);
    getApp().globalData.userInfo = res.data;
   }
  })；
 },
 
})