fetch('https://mywebsite.com/endpoint/', { 
 method: 'POST',
 headers: {
 'Accept': 'application/json',
 'Content-Type': 'application/json',
 },
 body: JSON.stringify({
 username: 'yourValue',
 pass: 'yourOtherValue',
 })
}).then((response) => response.json())
.then((res) => {
 console.log(res);
})
.catch((error) => {
 console.warn(error);
});

function toQueryString(obj) { 
 return obj ? Object.keys(obj).sort().map(function (key) {
  var val = obj[key];
  if (Array.isArray(val)) {
   return val.sort().map(function (val2) {
    return encodeURIComponent(key) + '=' + encodeURIComponent(val2);
   }).join('&');
  }

  return encodeURIComponent(key) + '=' + encodeURIComponent(val);
 }).join('&') : '';
}

// fetch
body: toQueryString(obj) 

$json = json_decode(file_get_contents('php://input'), true);
var_dump($json['username']); 

// 获取 app 进行数据集中处理
  if(!function_exists('apache_request_headers') ){
   $appName = $_SERVER['app'];
  }else{
   $appName = apache_request_headers()['app'];
  }

  // 对 RN fetch 参数解码
  if($appName == 'your settings') {
   $json = file_get_contents('php://input');
   $_POST = json_decode($json, TRUE );
  }

var App = {

 config: {

  api: 'your host',
  // app 版本号
  version: 1.1,

  debug: 1,
 },

 serialize : function (obj) {
  var str = [];
  for (var p in obj)
   if (obj.hasOwnProperty(p)) {
    str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
   }
  return str.join("&");
 },

 // build random number
 random: function() {
  return ((new Date()).getTime() + Math.floor(Math.random() * 9999));
 },



 // core ajax handler
 send(url,options) {
  var isLogin = this.isLogin();
  var self = this;


  var defaultOptions = {
   method: 'GET',
   error: function() {
    options.success({'errcode':501,'errstr':'系统繁忙,请稍候尝试'});
   },
   headers:{
    'Authorization': 'your token',
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    'App': 'your app name'
   },
   data:{
    // prevent ajax cache if not set
    '_regq' : self.random()
   },
   dataType:'json',
   success: function(result) {}
  };

  var options = Object.assign({},defaultOptions,options);
  var httpMethod = options['method'].toLocaleUpperCase();
  var full_url = '';
  if(httpMethod === 'GET') {
   full_url = this.config.api + url + '?' + this.serialize(options.data);
  }else{
   // handle some to 'POST'
   full_url = this.config.api + url;
  }

  if(this.config.debug) {
   console.log('HTTP has finished %c' + httpMethod + ': %chttp://' + full_url,'color:red;','color:blue;');
  }
  options.url = full_url;


  var cb = options.success;

  // build body data
  if(options['method'] != 'GET') {
   options.body = JSON.stringify(options.data);
  }

  // todo support for https
  return fetch('http://' + options.url,options)
    .then((response) => response.json())
    .then((res) => {
     self.config.debug && console.log(res);
     if(res.errcode == 101) {
      return self.doLogin();
     }

     if(res.errcode != 0) {

      self.handeErrcode(res);
     }
     return cb(res,res.errcode==0);
    })
    .catch((error) => {
     console.warn(error);
    });
 },


 handeErrcode: function(result) {
  //
  if(result.errcode == 123){


   return false;
  }

  console.log(result);
  return this.sendMessage(result.errstr);
 },


 // 提示类

 sendMessage: function(msg,title) {
  if(!msg) {
   return false;
  }
  var title = title || '提示';

  AlertIOS.alert(title,msg);
 }

};

module.exports = App;

App.send(url,{ 
 success: function(res,isSuccess) {
 }
})