封装的文件为http.js，import的storage是asyncStorage的setitem,getitem的封装。

let queryString = require('query-string');
import Storage from './storage'
import {
    Platform
} from 'react-native'

const os = Platform.OS;

function checkStatus(response) {
    if (response.status >= 200 && response.status < 300) {
        return response
    } else {
        let error = new Error(response.statusText)
        error.response = response
        throw error
    }
}
function parseJSON(response) {
    return response.json()
}
async function get(url, params) {
    if (params) {
        url += `?${queryString.stringify(params)}`
    }
    try {
        let headers = new Headers();
        let Access_Token = await Storage.getItem('Access_Token');
        if (Access_Token) {
            headers.append('Access_Token', Access_Token);
            headers.append('UserAgent',os);
        }
        console.log(headers,url)
        return fetch(url, {
            headers: headers
        })
            .then(checkStatus)
            .then(parseJSON)
    } catch (e) {
        throw new Error('get error')
    }

}

async function post(url, body) {
    let Access_Token = await Storage.getItem('Access_Token');
    let fetchOptions = {
        method: 'POST',
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json',
            'Access_Token': Access_Token ? Access_Token : '',
            'UserAgent':os
        },
        body: JSON.stringify(body)
    }
    return fetch(url, fetchOptions)
        .then(checkStatus)
        .then(parseJSON)
}

async function del(url, params) {
    if (params) {
        url += `?${queryString.stringify(params)}`
    }
    let Access_Token = await Storage.getItem('Access_Token');
    let fetchOptions = {
        method: 'DELETE',
        headers:{
            'Accept': 'application/json',
            'Content-Type': 'application/json',
            'Access_Token': Access_Token ? Access_Token : '',
            'UserAgent':os
        }
    }
    return fetch(url, fetchOptions)
        .then(checkStatus)
        .then(parseJSON)
}

async function update(url, body) {
    let Access_Token = await Storage.getItem('Access_Token');
    let fetchOptions = {
        method: 'PUT',
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json',
            'Access_Token': Access_Token ? Access_Token : '',
            'UserAgent':os
        },
        body: JSON.stringify(body)
    }
    return fetch(url, fetchOptions)
        .then(checkStatus)
        .then(parseJSON)
}

async function uploadFile(url, params, fileUrl,fileName) {
    let Access_Token = await Storage.getItem('Access_Token');
    let data = new FormData();
    data.append('file', {
        uri: fileUrl,
        name: fileName,
        type: 'image/jpeg'
    });

    Object.keys(params).forEach((key)=> {
        if (params[key] instanceof Date) {
            data.append(key, value.toISOString())
        } else {
            data.append(key, String(params[key]))
        }
    });
    const fetchOptions = {
        method: 'POST',
        headers: {
            'Accept': 'application/json',
            'Access_Token': Access_Token ? Access_Token : '',
            'UserAgent':os
        },
        body: data
    };
    return fetch(url, fetchOptions)
        .then(checkStatus)
        .then(parseJSON)
}
export default {
    get,
    post,
    del,
    update,
    uploadFile
}

在需要用到的地方引入http文件,接收两个参数，第一个是地址，第二个是请求参数。

使用方法