How to maintain login in uniapp

Uniapp is a cross-platform development framework, similar to React Native and Flutter, that can help developers quickly build cross-platform applications. During the development process, login maintenance is a very important step, which can prevent users from frequently entering account passwords and improve user experience. This article will introduce in detail how to use uniapp to implement the login retention function.

1. Basic concepts

During the development process, login retention usually means that after the user logs in, he does not need to re-enter his account and password the next time he opens the application. Implementing login persistence requires saving the user's login status locally, usually using cookies, localStorage or sessionStorage. It should be noted that the way the login status is saved should follow the corresponding security policy to prevent user information from being stolen.

2. Implement

1. Login page

On the login page, after the user enters the account and password, when the user clicks the login button, the information entered by the user should be The information is sent to the server for verification. If the verification is passed, the login status is saved locally. The code is as follows:

<template>
  <div>
    <input v-model="account" placeholder="请输入账号">
    <input type="password" v-model="password" placeholder="请输入密码">
    <button @click="login">登录</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      account: '',
      password: ''
    }
  },
  methods: {
    login() {
      // 发送登录请求，如果验证通过，将登录状态保存在本地
      // 代码省略
      uni.setStorageSync('token', 'xxxxxxx')
    }
  }
}
</script>

2. Main page

In the main page, you need to check the user's login status. If the user is already logged in, the corresponding content is displayed. The code is as follows:

<template>
  <div>
    <div v-if="isLogin">已登录</div>
    <div v-else>未登录</div>
  </div>
</template>

<script>
export default {
  computed: {
    isLogin() {
      // 检查本地是否保存了token
      // 如果保存了，说明用户已经登录
      return !!uni.getStorageSync('token')
    }
  }
}
</script>

In this example, the computed attribute is used to check the login status. When the user is logged in, returns true; otherwise returns false. It should be noted that uni's setStorageSync and getStorageSync methods are used here to save and obtain local data.

3. Notes

When using uniapp to implement the login retention function, you need to pay attention to the following points:

1. Security: When saving user information, you need to Pay attention to safety. It is recommended to use encryption algorithms to encrypt and store user information to prevent malicious attackers from stealing user information.
2. Expiration date: Login status should usually have an expiration date to ensure the security of user information. It is recommended to set an appropriate validity period and clear the corresponding login status after expiration.
3. Logout operation: Provide logout operation so that users can log out of their account or log in again. When logging out, the corresponding local data needs to be cleared.

4. Summary

This article introduces the method to implement the login retention function in uniapp. By saving the user's login status locally, users can avoid frequently entering account passwords and improve user experience. When implementing the login retention function, you need to pay attention to data security and validity period. I hope this article can help developers better implement the login retention function.

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