How to implement login function in uniapp

How to implement the login function in uniapp

In mobile application development, the login function is a very common requirement. If you are using uniapp to develop cross-platform applications, this article will provide you with a method to implement login functionality. uniapp is a cross-platform development framework based on the Vue.js framework. You can develop applications running on multiple platforms at the same time, such as iOS, Android, H5, etc.

Before you start, you need to understand the basic knowledge of uniapp and prepare a uniapp project.

1. Create a login page
   First, create a login page in the uniapp project. You can use the page template provided by uniapp or write one yourself.

In the login page, there need to be two input boxes for the user to enter the user name and password, and a login button to trigger the login operation. You can use the component library provided by uniapp to introduce these elements.

The following is a simple login page sample code:

<template>
  <view class="container">
    <input type="text" v-model="username" placeholder="请输入用户名" />
    <input type="password" v-model="password" placeholder="请输入密码" />
    <button @click="login">登录</button>
  </view>
</template>

<script>
export default {
  data() {
    return {
      username: '',
      password: ''
    };
  },
  methods: {
    login() {
      // 在这里编写登录逻辑
    }
  }
};
</script>

<style>
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
}
</style>

2. Write login logic
   Next, we need to write login logic. Typically, you need to send the username and password entered by the user to the backend server for verification. Since uniapp is a cross-platform application, we can use the network request API provided by uniapp to send requests.

The following is a sample code for a simple login logic:

import { request } from '@/utils/request';

// 在登录页面的methods中添加以下代码
methods: {
  async login() {
    try {
      const res = await request('/api/login', {
        method: 'POST',
        data: {
          username: this.username,
          password: this.password
        }
      });
      
      // 登录成功
      if (res.code === 200) {
        // 保存用户信息到本地storage或vuex中
        uni.setStorageSync('userInfo', res.data);
        
        // 跳转到首页
        uni.switchTab({
          url: '/pages/index/index'
        });
      } else {
        uni.showToast({
          icon: 'none',
          title: res.msg
        });
      }
    } catch (error) {
      console.error(error);
      uni.showToast({
        icon: 'none',
        title: '登录失败，请稍后重试'
      });
    }
  }
}

In the above code, we use the request function to initiate a network request. You can The actual situation encapsulates this function by itself.

3. Route Jump
   After successful login, we need to jump the user to the homepage of the application or other pages. In uniapp, you can use the uni.switchTab function to switch between bottom tab pages, and the uni.navigateTo function to jump between pages.

The following is a simple jump sample code:

// 登录成功后的跳转逻辑
uni.switchTab({
  url: '/pages/index/index'
});

4. Use login status check
   In order to prevent users from directly accessing the content that needs to be logged in without logging in page, we can check the login status when the page is entered.

Add the following code in the onLoad life cycle function in the page that needs to verify the login status:

// 验证登录状态
async onLoad() {
  // 获取本地存储的用户信息
  const userInfo = uni.getStorageSync('userInfo');
  
  if (!userInfo) {
    // 未登录，跳转到登录页面
    uni.navigateTo({
      url: '/pages/login/login'
    });
  } else {
    // 已登录，继续加载页面数据
    await this.loadData();
  }
}

In the above code, we use The uni.getStorageSync function obtains locally stored user information. If the user information does not exist, it means that the user is not logged in and jumps to the login page.

Through the above steps, we have implemented the login function in uniapp. Of course, the above code is just a simple example and you can modify and optimize it according to the specific situation. I hope this article can help you implement the login function in uniapp!

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