详解React Native网络请求fetch简单封装

 fetch('http://www.pintasty.cn/home/homedynamic', {
      method: 'POST',
      headers: { //header
        'token': 'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VySWQiOiJVLTliZGJhNjBjMjZiMDQwZGJiMTMwYWRhYWVlN2FkYTg2IiwiZXhwaXJhdGlvblRpbWUiOjE0NzUxMTg4ODU4NTd9.ImbjXRFYDNYFPtK2_Q2jffb2rc5DhTZSZopHG_DAuNU'
      },
      body: JSON.stringify({ //参数
        'start': '0',
        'limit': '20',
        'isNeedCategory': true,
        'lastRefreshTime': '2016-09-25 09:45:12'
      })
    })
      .then((response) => response.json()) //把response转为json
      .then((responseData) => { // 上面的转好的json
          alert(responseData); /
        // console.log(responseData);
      })
      .catch((error)=> {
        alert('错误了');
      })
  }

var HTTPUtil = {};

/**
 * GET请求
 */
HTTPUtil.get = function(url, params, headers) {
  if (params) {
    let paramsArray = [];
    //encodeURIComponent
    Object.keys(params).forEach(key => paramsArray.push(key + '=' + params[key]))
    if (url.search(/\?/) === -1) {
      url += '?' + paramsArray.join('&')
    } else {
      url += '&' + paramsArray.join('&')
    }
  }
  return new Promise(function (resolve, reject) {
   fetch(url, {
      method: 'GET',
      headers: headers,
     })
     .then((response) => {
       if (response.ok) {
         return response.json();
       } else {
         reject({status:response.status})
       }
     })
     .then((response) => {
       resolve(response);
     })
     .catch((err)=> {
      reject({status:-1});
     })
  })
}


/**
 * POST请求 FormData 表单数据
 */
HTTPUtil.post = function(url, formData, headers) {
  return new Promise(function (resolve, reject) {
   fetch(url, {
      method: 'POST',
      headers: headers,
      body:formData,
     })
     .then((response) => {
       if (response.ok) {
         return response.json();
       } else {
         reject({status:response.status})
       }
     })
     .then((response) => {
       resolve(response);
     })
     .catch((err)=> {
      reject({status:-1});
     })
  })
}

export default HTTPUtil;

 let formData = new FormData(); 
formData.append("id",1060); 
 let url='http://www.pintasty.cn/home/homedynamic';
  let headers='';
HTTPUtil.post(url,formData,headers).then((json) => { 
  //处理 请求结果 
  },(json)=>{ 
   //TODO 处理请求fail   
})