微信小程序账号密码登入和传值的实现方法

<!--pages/login/login.wxml-->
<view class="content">

<view class="account">
<view class="title">账号</view>
<view class="num"><input bindinput="inputName" placeholder="教师姓名"  placeholder-style="color:#999999;"/></view>
</view>

<view class="hr"></view>

<view class="account">
<view class="title">密码</view>
<view class="num">
<input bindinput="inputPassWord" placeholder="输入密码" password/></view>
</view>

<view class="hr"></view>

<button class="btn" type="primary" bindtap="login">登入</button> 
 
</view>

.content{
  margin-top: 40px;
}
.account{
   display: flex;
   flex-direction: row;
   padding-left: 20px;
   padding-top: 20px;
   padding-bottom: 10px;
   width: 90%;
}
.title{
   margin-right: 30px;
   font-weight: bold;
}
.hr{
  border: 1px solid #cccccc;
  opacity: 0.2;
  width: 90%;
  margin: 0 auto;
  background-color: red;
}
.btn{
  width: 90%;
  margin-top:40px;
  color: #999999;
}

let app = getApp();
// 获取云数据库引用
const db = wx.cloud.database();
// const admin = db.collection('user');//注意，这里就是刚才的集合的名字——user
let studentname = null;//变量，用于存放用户输入的账号
let password = null;//变量，用于存放用户输入的密码

Page({
  
 // data: {
  //},

  //输入用户名
  inputName: function (event) {
    studentname  = event.detail.value//将用户输入的账号放到变量里面
  },
  //输入密码
  inputPassword(event) {
    password = event.detail.value//将用户输入的密码放到变量里面
  },

  //登陆函数
    async  login() {
    const db = wx.cloud.database()
    let count = await db.collection('user').count()     //获取数据库总个数
    count=count.total     //将总个数赋值给count
  //通过for循环做多次请求，并把多次请求的数据放在一个数组里面
      let all = []
      for(let i = 0; i<count; i+=20){
        let list = await db.collection('user').skip(i).get()
        all=all.concat(list.data);
        console.log('返回的结果',all)

        for(let i=0;i<all.length;i++ ){
          if (studentname===all[i].stname) {
            if (password===all[i].password) {
              console.log('登入成功')
              wx.showToast({
                title: '登入成功',
                icon:'success',
                duration:2500
              })
              wx.reLaunch({
                url: '/pages/index/index?studentname='+studentname,//这里是成功登录后跳转的页面',
              })


            } else {
              console.log('密码错误')
              wx.showToast({
                title: '密码错误',
                icon:'none',
                duration:2500
              })
            }

          } else {
            console.log('登入失败')
            wx.showToast({
              title: '无此用户名！！',
              icon:'none',
              duration:2500
            })
          }
  }
      }
        }
        })   

 "tabBar": {
    "color": "#Fc0",
    "selectedColor": "#f4c903",
    "borderStyle": "white",
    "list": [
      {
        "selectedIconPath": "images/1.png",
        "iconPath": "images/1.png",
        "pagePath": "pages/index/index",
        "text": "登记"
      },

      {
        "selectedIconPath": "images/3.png",
        "iconPath": "images/3.png",
        "pagePath": "pages/center/center",
        "text": "排行榜"
      }
    ]
  },

              wx.reLaunch({                             
             url: '/pages/index/index?studentname='+studentname,//这里是成功登录后跳转的页面
             })

<text>您好！{{orderId}}老师！</text>

// index.js
Page({
onLoad: function (options) {
  console.log(options); // options里面是上级页面传来的参数（教师姓名）
  let id = options.studentname;
  this.setData({
    orderId: id
  });
}
})