扩展mockjs对xhr、fetch的模拟方法，示例

import mock from '@mmp/mock'

mock.setup({
  timeout: '100-200'
})
mock.mock(/\/api\/.*/, () => {
  return {response: {success: true, data: {}}, status: 200, statusText: 'OK', headers: {'x-api': 1}}
})
mock.mock(/\/test\/.*/, () => {
  return {response: {success: true, data: {}}, status: 200, statusText: 'OK', headers: {'x-test': 1}}
})

function test1() {
  window.fetch('/api/xxx').then(r => {
    console.log(r)
    r.json().then(d => {
      console.log(d)
    })
  })
}

function test2() {
  window.fetch('/test/xxx').then(r => {
    console.log(r)
    r.text().then(d => {
      console.log(d)
    })
  })
}

function test3() {
  let responseType = 'json'
  let request = new XMLHttpRequest();
  request.onreadystatechange = function () {
    if (!request || request.readyState !== 4) {
      return;
    }
    if (request.status === 0 && !(request.responseURL && request.responseURL.indexOf('file:') === 0)) {
      return;
    }
    let responseHeaders = {}
    request.getAllResponseHeaders().split('\n').forEach((e, i) => {
      let kv = e.split(':', 2)
      responseHeaders[kv[0]] = kv[1]
    });

    let responseData = responseType === 'json' ? request.response : request.responseText;
    let response = {
      data: responseData,
      status: request.status,
      statusText: request.statusText,
      headers: responseHeaders,
      request: request
    };
    console.log(response)
  }
  request.open('post', '/api/xxxxx')
  request.responseType = responseType
  request.send('test')
}