smart-admin/rc-busness/config/async/fetch.js

import {
  baseUrl
} from './env'

export default async(url = '', data = {}, type = 'GET', method = 'fetch') => {
  type = type.toUpperCase()
  url = baseUrl + url 

  if (type === 'GET') {
    // 数据拼接字符串
    let dataStr = ''
    Object.keys(data).forEach(key => {
      dataStr += key + '=' + data[key] + '&'
    })

    if (dataStr !== '') {
      dataStr = dataStr.substr(0, dataStr.lastIndexOf('&'))
      url = url + '?' + dataStr
    }
  }

  if (window.fetch && method === 'fetch') {
	let token='';
	let tokenStr = localStorage.getItem("userInfo");
	if(tokenStr){
		tokenStr = JSON.parse(tokenStr);
	if(tokenStr && tokenStr.xaccessToken)
		token=tokenStr.xaccessToken;
	}
    let requestConfig = {
      method: type,
      headers: {
        // 'Accept': 'text/plain',
        'Content-Type': 'application/json',
		'x-access-token': token
      },
      mode: 'cors',
      // channelId:'H5@2021',
      cache: 'force-cache'
    }

    if (type === 'POST') {
      Object.defineProperty(requestConfig, 'body', {
        value: JSON.stringify(data)
      })
    }
    try {
      const response = await fetch(url, requestConfig)
      const responseJson = await response.json()
      return responseJson
    } catch (error) {
      throw new Error(error)
    }
  } else {
       
    return new Promise((resolve, reject) => {
      let requestObj
      
      if (window.XMLHttpRequest) {
        requestObj = new XMLHttpRequest()
      }
    
      let sendData = ''
      if (type === 'POST') {
        sendData = JSON.stringify(data)
        
      }
      requestObj.open(type, url, true)
      requestObj.setRequestHeader('Content-Type', 'application/json')
      requestObj.send(sendData)
      

      requestObj.onreadystatechange = () => {
        if (requestObj.readyState === 4) {
          if (requestObj.status === 200) {
            let obj = requestObj.response
            if (typeof obj !== 'object') {
              obj = JSON.parse(obj)
            }
            resolve(obj)
          } else {
            reject(requestObj)
          }
        }
      }
    })
  }
}