class Api {

  constructor() {
    this.ajax = new XMLHttpRequest();
    this.baseUrl = config.baseUrl();
  }

  get(option) {
    // toast.loading();

    // 转换get参数
    var params = "";
    for (const key in option.data) {
      params+= `&${key}=${option.data[key]}`
    }

    params = params.replace("&", "?")
    option.url = this.baseUrl + option.url + params;

    return new Promise((resolve,reject) => {
      this.ajax.open("GET",option.url);
      this.ajax.send();
      return this.readystatechange(resolve, reject)
    });
  }

  post(option) {
    this.ajax = new XMLHttpRequest();
    toast.loading();
    return new Promise( (resolve,reject) => {
      this.ajax.open("POST",this.baseUrl+option.url);
      this.ajax.setRequestHeader("Content-Type","application/json");
      this.ajax.setRequestHeader("bmy","liubing");

      this.ajax.send(option.data);
      return this.readystatechange(resolve, reject)
    });
  }

  readystatechange(success,error) {
    this.ajax.onreadystatechange = () => {
      if (this.ajax.readyState == 4 ) {
        if (this.ajax.status == 200) {
          var data = JSON.parse(this.ajax.response);
          // toast.clearLoading();
          switch (data.status) {
            case 200:
              success(data.result);
              break;
            case 500:
              toast.tips({ message: data.message });
              throw new Error(data.message);
              break;
          }
        } else {
          error && error(this.ajax)
          throw new Error("网络请求出错");
        }
      }
    }
  }

}