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In Vue, sending a POST request is a very common operation, which can be achieved in many ways. This article will introduce several methods of sending a POST request in Vue, and will explain it in detail with examples.

Method 1: Using Vue-resource

Vue-resource is an HTTP library officially recommended by Vue.js, which can easily send HTTP requests. The steps to use Vue-resource to send a POST request in Vue are as follows:

1. Import Vue-resource

Import Vue-resource in main.js:

import VueResource from 'vue-resource'
Vue.use(VueResource)

2. Sending a POST request

Send a POST request in the component:

this.$http.post('/api/data', { name: 'vue', age: 3 }).then(response => {
  console.log(response.body)
}, error => {
  console.log(error)
})

The first parameter is the requested URL, and the second parameter is the requested data.

Method 2: Using Axios

Axios is a Promise-based HTTP library that can be used in browsers and Node.js. The steps to use Axios to send a POST request in Vue are as follows:

1. Install Axios

Install Axios by typing the following command in the command line:

npm install axios --save

2. Sending a POST request

Send a POST request in the component:

import axios from 'axios'
axios.post('/api/data', { name: 'vue', age: 3 }).then(response => {
  console.log(response.data)
}).catch(error => {
  console.log(error)
})

The first parameter is the requested URL, and the second parameter is the requested data.

Method 3: Using native Ajax

You can also use native Ajax to send POST requests in Vue. You only need to write Ajax code in the component. Here is an example:

let xhr = new XMLHttpRequest();
xhr.open('POST', '/api/data', true);
xhr.setRequestHeader('Content-type', 'application/json');
xhr.onreadystatechange = function () {
  if (xhr.readyState === 4 && xhr.status === 200) {
    console.log(xhr.responseText);
  }
};
xhr.send(JSON.stringify({ name: 'vue', age: 3 }));

The first parameter is the requested URL, and the second parameter is the requested data.

To sum up, the above are several ways to send POST requests in Vue. You can choose the appropriate method to send the request according to your actual needs.

In addition, in actual development, you need to pay attention to the following points when sending POST requests:

1. Request Header

When sending a POST request, you need to set the request header to tell the server the requested data format. Common request headers include 'Content-type: application/json' and 'Content-type: application/x-www-form-urlencoded'. If the data sent is in JSON format, use 'Content-type: application/json'. If the data sent is in form format, use 'Content-type: application/x-www-form-urlencoded'.

2. CSRF Protection

When sending a POST request, you need to be aware of CSRF (Cross-site request forgery) attacks. A CSRF attack is when an attacker uses the victim's identity to send malicious requests to the server without the victim's knowledge, thereby achieving the purpose of the attack. To prevent CSRF attacks, when sending a POST request, you need to add a CSRF Token to the request header.

3. Data Format

When sending a POST request, you need to format the data into a suitable format according to the backend's requirements. Common data formats include JSON format and form format. If the data sent is in JSON format, you need to serialize the data into a JSON string. If the data sent is in form format, you need to serialize the data into key=value format.

In short, when sending a POST request, you need to choose the appropriate method according to the actual situation, and pay attention to issues such as request headers, CSRF protection, and data format.