案例——登录界面

登录小程序介绍

当获取到用户信息时，自动登陆。如果没有获取到用户信息，则跳转到登录界面。

登录小程序实例代码

1.创建一个新工程
2.删除logs文件夹
3.建立login和user界面
4.login.js：

loginBtnClick: function () {
    // 用户名和密码验证的过程
    app.appData.userinfo = { username:this. data.username, password:this.data.password }
    wx.switchTab({ url: "../user/user" })
  },

  usernameInput: function (event) {
    console.log(event)
    this.setData({ username:event.detail.value })
  },
  passwordInput: function (event) {
    this.setData({ password: event.detail.value })
  }

login.wxml

<view class="mcontainer">
    <view class="item">
        <image src="../../images/20.png" class="image"/>
    </view>

    <view class="item">
       <view class="login-item">
       	    <view class="login-item-info">用户名</view>
            <view><input bindinput="usernameInput" /></view>
       </view>
       <view class="login-item">
            <view class="login-item-info">密码</view>
            <view class="login-pwd">
            
            <input style="flex-grow:1" password="true"  bindinput="passwordInput"/> 
            <text> 忘记密码 </text>
            
            </view>
       </view>
       <view class="login-item bottom">
            <button class="login-btn" bindtap="loginBtnClick">登录</button>
       </view>
    </view>


    <view class="item bottom-info">
       <view> 没有账户? <text> 注册 </text> </view>
       <view class="wechat-icon">
            <image src="../../images/21.png"  />
       </view>
    </view>


</view>

login.wxss

.mcontainer {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
} 

.item{
    flex-grow:1;
    height: 30%;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width: 96%;
    padding: 0 2%;
}

.image{
    width: 500rpx;
    height: 150rpx;  
}

.login-item{
    width: 90%;
    margin-top: 30rpx;
    border-bottom: 1px solid #eee;
    flex-grow:1;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding-bottom: 20rpx;
}

 .bottom{
     border-bottom: 0px;
}

.login-item-info{
    font-size: 8px;
    color: #888;
     padding-bottom: 20rpx;
}

.login-pwd{
    display: flex;
    justify-content: space-between;
    flex-grow: 1;
    align-items: center;
  
}

.login-pwd text{
    height: 100%;
    font-size: 14px;
    color: #888;
    display: flex;
     
}
.login-btn{
    width: 80%;
    color: white;
    background-color: green;
    border-radius: 0;
    font-size: 14px;

}

.login-btn:hover{
    width: 80%;
    color: white;
    border-radius: 0;

}

.bottom-info{

}

.wechat-icon{
    margin-top: 30px;
    width: 30px;
    height: 30px;
    border: 1px solid seagreen;
    border-radius: 50%;
    padding: 10px;
}

.wechat-icon image{
    width: 33px;
    height: 33px;
}

5.user.js

 data: {
    username: null
  },
  onLoad: function (options) {
    if (app.appData.userinfo ==null) {
      wx.redirectTo({ url: "../login/login" })
    } else {
      this.setData({ username: app.appData.userinfo.username })
    }
  },

user.wxml

<view class="index-container">
   <image  src="../../images/uc.jpg" ></image>
   <view class="nickname">
      {{username}}
   </view>
</view>

user.wxss

.index-container{
  width: 100%;
  height: 100%;
  position: relative;
}

.index-container image{
  width: 100%;
  height: 550px;
}

.nickname{
  position: absolute;
  top: 170px;
  left: 120px;
  font-size: 25px;
}

6.示例

来源：CSDN

作者：qq_44760153

链接：https://blog.csdn.net/qq_44760153/article/details/104598646