class Api {

  constructor() {
    this.ajax = new XMLHttpRequest();
    this.baseUrl = "http://127.0.0.1:8090/api";
  }

  get(option) {

    // 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;

    this.ajax.open("GET",option.url);
    this.ajax.send();
    this.readystatechange(option.success,option.error)
  }

  post(option) {
    this.ajax.open("POST",this.baseUrl+option.url);
    this.ajax.setRequestHeader("Content-Type","application/json");
    this.ajax.send(JSON.parse(option.data));
    this.readystatechange(option.success,option.error)
  }


  readystatechange(success,error) {
    this.ajax.onreadystatechange = () => {
      if (this.ajax.readyState == 4 ) {
        if (this.ajax.status == 200) {
          success(JSON.parse(this.ajax.response))
        } else {
          error && error(this.ajax)
          // console.log("网络请求出错")
        }
      }
    }
  }

}

var api = new Api();