Use FETCH to encapsulate the network request and return a Promise object

Address: www.cnblogs.com/canghaiyime…

Basic Usage of FETCH

// Encapsulate the GET request export function httpGet(URL){var result = fetch(URL) return result httpPost(url,data){ var result = fetch(url,{ method:'post', Headers: {' Accept ':' application/json, text/plain, * / * ', / * format restrictions: Json, text, other formats */ 'content-type ':' Application /x-www-form-urlencoded'/* Request Content Type */}, //data form data, Username =tony&pwd=123456 body: json.stringify (data)}) return result}Copy the code

Here’s how to wrap the Fetch with a Promise and return a Promise object

const headers = new Headers({
  'Accept': 'application/json',
  'Content-Type': 'application/json'
});

function get (url) {
  return fetch(url, {
    method: 'GET',
    headers: headers
  }).then(response => {
    return handleResponse(url, response);
  }).catch(err => {
    console.error(`Request failed. Url = ${url} . Message = ${err}`);
    return {error: {message: 'Request failed.'}};
  })
}

function post (url, data) {
  return fetch(url, {
    method: 'POST',
    headers: headers,
    body: JSON.stringify(data)
  }).then(response => {
    return handleResponse(url, response);
  }).catch(err => {
    console.error(`Request failed. Url = ${url} . Message = ${err}`);
    return {error: {message: 'Request failed.'}};
  })
}

function put (url, data) {
  return fetch(url, {
    method: 'PUT',
    headers: headers,
    body: JSON.stringify(data)
  }).then(response => {
    return handleResponse(url, response);
  }).catch(err => {
    console.error(`Request failed. Url = ${url} . Message = ${err}`);
    return {error: {message: 'Request failed.'}};
  })
}

function handleResponse (url, response) {
  if (response.status < 500) {
    return response.json();
  } else {
    console.error(`Request failed. Url = ${url} . Message = ${response.statusText}`);
    return {error: {message: 'Request failed due to server error '}};
  }
}

export {get, post, put}
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