How to handle network request errors and exceptions in Vue technology development

How to handle network request errors and exceptions in Vue technology development requires specific code examples

In Vue technology development, network requests are an inevitable link. However, it is not uncommon for requests to have errors or exceptions due to various network problems, such as request timeouts, network disconnections, etc. In order to improve user experience and system stability, we need to handle these errors and exceptions reasonably.

Vue provides a powerful set of tools and techniques to handle errors and exceptions in network requests. Below, we'll cover some common error and exception handling methods and provide specific code examples for each method.

1. Use the axios library for network requests

axios is a popular Promise-based HTTP client library that is widely used to handle network requests. It provides a wealth of functions and APIs, including request and response interception, request timeout, etc. The following is an example of using axios to make a network request:

import axios from 'axios';

axios.get('/api/data')
  .then(response => {
    // 请求成功处理逻辑
    console.log(response.data);
  })
  .catch(error => {
    // 请求失败处理逻辑
    console.error(error);
  });

In the above code, we use axios to send a GET request to the /api/data interface. If the request is successful, we can get the returned data through response.data; if the request fails, we can get the error information through error.

2. Unified handling of network request errors and exceptions

In order to better manage network request errors and exceptions, we can handle them in a unified manner to reduce code redundancy and improve development efficiency. We can achieve this through axios' response interceptor. Here is an example:

import axios from 'axios';

// 请求拦截器
axios.interceptors.request.use(config => {
  // 在请求发送之前，可以做一些通用逻辑
  return config;
}, error => {
  // 请求发送失败
  return Promise.reject(error);
});

// 响应拦截器
axios.interceptors.response.use(response => {
  // 请求成功处理逻辑
  return response;
}, error => {
  // 请求失败处理逻辑
  console.error(error);
  return Promise.reject(error);
});

axios.get('/api/data')
  .then(response => {
    console.log(response.data);
  })
  .catch(error => {
    console.error(error);
  });

By using request interceptors and response interceptors, we can perform additional logic processing before the request is sent and after the request succeeds or fails. For example, we can add common request header information before sending the request, or do some error logging after the request fails, etc.

3. Friendly prompts for network request errors and exceptions

In addition to handling network request errors and exceptions, we also need to provide friendly prompts to users to increase user experience. In Vue, this can be achieved through components. Here is an example:

<template>
  <div>
    <button @click="getData">获取数据</button>
    <p v-if="loading">正在加载中...</p>
    <p v-if="error">请求失败，请重试。</p>
    <ul v-if="data">
      <li v-for="item in data" :key="item.id">{{ item.name }}</li>
    </ul>
  </div>
</template>

<script>
import axios from 'axios';

export default {
  data() {
    return {
      loading: false,
      data: null,
      error: false
    }
  },
  methods: {
    getData() {
      this.loading = true;
      this.error = false;

      axios.get('/api/data')
        .then(response => {
          this.loading = false;
          this.data = response.data;
        })
        .catch(error => {
          this.loading = false;
          this.error = true;
          console.error(error);
        });
    }
  }
}
</script>

In the above code, we use a button to trigger the operation of obtaining data. When the button is clicked, the corresponding status prompt information will be displayed. If the request is successful, the returned data will be displayed; if the request fails, an error message will be displayed.

Through the above code examples, we can see how to handle network request errors and exceptions in Vue technology development. We can use the axios library to send network requests and uniformly handle errors and exceptions through the response interceptors it provides. At the same time, we can also provide users with friendly prompt information through components to improve user experience. These methods can effectively help us deal with errors and exceptions in network requests, improving development efficiency and system stability.

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