React Native使用fetch实现图片上传的示例代码

let common_url = 'http://192.168.1.1:8080/'; //服务器地址let token = '';  //用户登陆后返回的token/**  * 使用fetch实现图片上传 * @param {string} url 接口地址 * @param {JSON} params body的请求参数 * @return 返回Promise  */function uploadImage(url,params){  return new Promise(function (resolve, reject) {    let formData = new FormData();    for (var key in params){      formData.append(key, params[key]);    }    let file = {uri: params.path, type: 'application/octet-stream', name: 'image.jpg'};    formData.append("file", file);    fetch(common_url + url, {      method: 'POST',      headers: {        'Content-Type': 'multipart/form-data;charset=utf-8',        "x-access-token": token,      },      body: formData,    }).then((response) => response.json())      .then((responseData)=> {        console.log('uploadImage', responseData);        resolve(responseData);      })      .catch((err)=> {        console.log('err', err);        reject(err);      });  });}

let params = {  userId:'abc12345',  //用户id  path:'file:///storage/emulated/0/Pictures/image.jpg'  //本地文件地址}uploadImage('app/uploadFile',params )  .then( res=>{    //请求成功    if(res.header.statusCode == 'success'){      //这里设定服务器返回的header中statusCode为success时数据返回成功      upLoadImgUrl = res.body.imgurl; //服务器返回的地址    }else{       //服务器返回异常，设定服务器返回的异常信息保存在 header.msgArray[0].desc      console.log(res.header.msgArray[0].desc);    }  }).catch( err=>{      //请求失败  })