The role and usage of routing guards in uniapp

The role and usage of route guards in uniapp

1. Introduction

In the process of developing uniapp applications, we often encounter some problems that require Scenarios where users make permission judgments or page jumps. In order to realize these functions, uniapp provides a route guard mechanism. Through route guards, users can verify permissions or perform other operations before routing jumps, thereby achieving more flexible and secure applications.

2. The role of routing guards

Routing guards are mainly used to control page access permissions and implement global interception operations. By executing some code logic before the route jumps, we can achieve the following functions:

1. Permission verification: It can be judged whether the user has the right to access a certain page based on the user's role or login status and other information. If you don't have permission, you can jump to the login page or other pages.
2. Page record: It can record the pages visited by the user, so that the page can be forwarded or retracted when needed.
3. Route interception: You can perform some interception operations before route jump, such as obtaining user information, checking network status, etc.

3. Usage of routing guards

The routing guards in uniapp mainly include global guards and local guards.

1. Global guard

Global guard refers to the configuration in the main.js file in the root directory of the project and takes effect on all routes. We can perform some global operations in the global guard, such as login check, page access permission verification, etc.

In the main.js file, we can define global guards through the beforeEach and afterEach methods provided by uni-app:

import Vue from 'vue'
import App from './App'

Vue.config.productionTip = false

// 全局前置守卫
uni.$beforeEach((to, from, next) => {
  // 在这里进行权限验证或者其他操作
  next() // 调用next()方法才能进行跳转
})

// 全局后置守卫
uni.$afterEach((to, from) => {
  // 在这里进行一些全局操作
})

App.mpType = 'app'

const app = new Vue({
  ...App
})
app.$mount()

2. Local guards

Partial guard refers to configuration in a specific page file, which only takes effect on the current page. We can define local guards in the life cycle hook function in the page file.

For example, to define a local guard in a page file, you can add logic in the created life cycle hook function of the vue instance of the page:

export default {
  created() {
    // 在这里添加局部守卫的逻辑
  }
}

4. Code example of routing guard

The following is an example that demonstrates how to use uniapp's routing guard to perform permission judgment and page jump.

1. Global guard code example:

uni.$beforeEach((to, from, next) => {
  // 判断用户是否已登录
  if (to.path !== '/login' && !uni.getStorageSync('token')) {
    // 如果用户未登录，则跳转到登录页面
    next('/login')
  } else {
    // 用户已登录，可以继续访问目标页面
    next()
  }
})

2. Local guard code example:

export default {
  created() {
    // 判断用户是否有访问当前页面的权限
    if (!this.$store.state.user.isAdmin) {
      // 如果用户不是管理员，则跳转到首页
      uni.redirectTo({
        url: '/pages/index/index'
      })
    }
  }
}

Through the above example, we can As you can see, route guards provide uniapp with a convenient and flexible way to control page access permissions and implement global interception operations. In actual projects, we can configure routing guards according to specific needs to better ensure application security and user experience.

Summary:

This article introduces the role and usage of routing guards in uniapp, and gives specific code examples. By using route guards, we can implement user permission verification, page access control, and other global operations, thereby improving application security and user experience. I hope this article can help you better use the route guard mechanism of uniapp.

The above is the detailed content of The role and usage of routing guards in uniapp. For more information, please follow other related articles on the PHP Chinese website!