微信小程序简洁登录页面的实现(附源码)

<view class="v1" style="height:{{clientHeight?clientHeight+'px':'auto'}}">
 
 <!-- v2父容器  子view使用绝对布局 -->
   <view class="v2">
     <view class="dltext" style="width: 232rpx; height: 92rpx; display: block; box-sizing: border-box; left: 0rpx; top: -2rpx">登录</view>
  
     <!-- 手机号 -->
     <view class="phoneCs">
       <!-- <image src="/images/zhang.png" class="ph"></image> -->
       <input placeholder="请输入账号" type="number" bindinput="content" />
     </view>
     <!-- 密码 -->
     <view class=passWordCs">
       <!-- <image src="/images/mi.png" class="ps"></image> -->
       <input placeholder="请输入密码" type="password" bindinput="password" />
     </view>
     <!-- 登录按钮 -->
     <view class="denglu">
       <button class="btn-dl" type="primary" bindtap="Goadmin">登录</button>
     </view>
   </view>
 </view>

.v1{
  display: block;
  position:absolute;
  width: 100%;
  background-color: rgb(250, 248, 248);
}

.v1 .v2{
  position: relative;
  margin-top: 150rpx;
  left: 100rpx; 
  width: 545rpx;
  height: 600rpx;
  background-color: rgb(250, 248, 248);
  border-radius: 50rpx;
}

.v1 .v2 .dltext{
  margin-top: 50rpx;
  position: absolute;
  margin-left:50rpx;
  width: 150rpx;
  height: 100rpx;
  font-size: 60rpx;
  font-family: Helvetica;
  color: #000000;
  line-height: 100rpx;
  letter-spacing: 2rpx;
}

.v1 .v2 .phoneCs{
  margin-top: 200rpx;
  margin-left: 25rpx;
  position: absolute;
  display: flex;
  width:480rpx ;
  height: 90rpx ;
  background-color: white;
  
}

.v1 .v2 .phoneCs .ph{
  margin-top: 5rpx;
  margin-left: 30rpx;
  width: 55rpx;
  height: 55rpx;
}

.v1 .v2 .phoneCs input{
  width: 400rpx;
  font-size: 30rpx ;
  margin-top: 25rpx;
  margin-left: 30rpx;
}

.v1 .v2 .passwordCs{
  margin-top: 350rpx;
  margin-left: 25rpx;
  position: absolute;
  display: flex;
  width:480rpx ;
  height: 90rpx ;
  background-color: white;

}

.v1 .v2 .passwordCs .ps{
  margin-top: 5rpx;
  margin-left: 30rpx;
  width: 55rpx;
  height: 55rpx;
}

.v1 .v2 .passwordCs .eye{
  margin-top: 5rpx;
  margin-left: 65rpx;
  width: 55rpx;
  height: 55rpx;
}

.v1 .v2 .passwordCs input{
  width: 400rpx;
  font-size: 30rpx ;
  margin-top: 25rpx;
  margin-left: 30rpx;
}

.v1 .v2 .denglu{
  width: 480rpx;
  height: 80rpx;
  position: absolute;
  margin-top:515rpx;
  margin-left:25rpx;
  
}

.v1 .v2 .denglu button{
  padding: 0rpx;
  line-height: 70rpx;
  font-size: 30rpx;
  width: 100%;
  height: 100%;
  border-radius: 5rpx;
}

//index.js
//获取应用实例
const app = getApp()
 let username=''
 let password=''
Page({
  data: {
    username: '',
    password: '',
    clientHeight:''
  },
  onLoad(){
    var that=this
    wx.getSystemInfo({ 
      success: function (res) { 
        console.log(res.windowHeight)
          that.setData({ 
              clientHeight:res.windowHeight
        }); 
      } 
    }) 
  },
  //协议
  goxieyi(){
   wx.navigateTo({
     url: '/pages/oppoint/oppoint',
   })
  },
  //获取输入款内容
  content(e){
    username=e.detail.value
  },
  password(e){
    password=e.detail.value
  },
  //登录事件
  goadmin(){
    let flag = false  //表示账户是否存在,false为初始值
    if(username=='')
    {
      wx.showToast({
        icon:'none',
        title: '账号不能为空',
      })
    }else if(password==''){
      wx.showToast({
        icon:'none',
        title: '密码不能为空',
      })
    }else{
      wx.cloud.database().collection('adminShop')
      .get({
        success:(res)=>{
          console.log(res.data)
          let admin=res.data
          for (let i = 0; i < admin.length; i++) {  //遍历数据库对象集合
            if (username === admin[i].username) { //账户已存在
              flag=true;
              if (password !== admin[i].password) {  //判断密码正确与否
                wx.showToast({  //显示密码错误信息
                  title: '密码错误！！',
                  icon: 'error',
                  duration: 2500
                });
               break;
              } else {
                wx.showToast({  //显示登录成功信息
                  title: '登陆成功！！',
                  icon: 'success',
                  duration: 2500
                })
                flag=true;
                wx.setStorageSync('admin', password)
               wx.navigateTo({
                 url: '/pages/admin/admin',
               })
                break;
              }
            }
          };
          if(flag==false)//遍历完数据后发现没有该账户
          {
            wx.showToast({
              title: '该用户不存在',
              icon: 'error',
              duration: 2500
            })
          }
        }
      })
    }
  },
})