ajax请求在IE下请求失败

项目要求兼容IE，但是在IE edge下加载不出数据，debug后发现所有ajax请求都失败,
{readyState: 0, responseJSON: undefined, status: 0, statusText: "error"}

image.png

ajax集中请求代码

   const xhr = ({ url, body = null, method = 'get', contentType = "application/x-www-form-
  urlencoded; charset=UTF-8" }) => {
  const defer = $.Deferred();

  const request = $.ajax({
    type: method,
    url: url,
    data: body,
    contentType: contentType,
    dataType: "json",
    xhrFields: {
      withCredentials: true
    }
  })
  .done((data) => {
    if (data && data.errcode === 0) {
      defer.resolve(data.data);
    } else {
      defer.reject(data.errmsg);
    }
  })
  .fail((data) => {
    defer.reject(data.errmsg);
  });
  return {
    request: request,
    promise: defer.promise()
  };
};

export default xhr;

axios

不用$.ajax，试了axios，还是一样ie edge加载不出

下篇：1.Deferred对象使用