微信小程序封装Request类

封装Request Http拦截

使用Promise，避免回调金字塔
也可以封装一个Promise类

/* 请求封装 */
const apiAgree = "https"; // 全局默认协议
const apiHttpHost = "www.xxx.com";
const apiHttpsHost = "www.xxx.com";


function f(url,method,data,headers,agree){
  let apiHost = agree == "https"?apiHttpsHost:apiHttpHost;
  let apiUrl = agree + "://" + apiHost + url;
  data = data || {};
  let header = headers || {};
  let sessionId =  wx.getStorageSync("UserSessionId"); // 获取缓存会话
  if (!header || !header["SESSIONID"]) {
    header["SESSIONID"] = sessionId;
  }

  console.log("==================REQUEST BEGIN====================");
  console.log("agree:", agree);
  console.log("apiHost:", apiHost);
  console.log("apiUrl:", apiUrl);
  console.log("method:", method);
  console.log("data:", data);
  console.log("header:", header);
  console.log("==================REQUEST END====================");

  wx.showNavigationBarLoading();
  let promise = new Promise(function(resolve,reject){
    wx.request({
      url: apiUrl,
      method:method,
      header:header,
      data:data,
      success:function(res){
        if(typeof res.data === "object"){
          if(res.data.status){
            if (res.data.status === -200) {
              // 需要重新登录
              wx.showToast({
                title: res.data.msg,
                icon: "none"
              });
              reject("请重新登录");
            } else if (res.data.status === -1) {
              // 普通的请求错误
              reject("请求错误");
            }
          }
        }
        resolve(res);
      },
      fail:reject("error"),
      complete: function () { wx.hideNavigationBarLoading();}
    })
  })
  return promise;
}

// 导出模块
module.exports = {
  "get":function(url, data, header, agree = apiAgree){
    return f(url,"GET", data ,header , agree);
  },
  "post": function (url, data, header, agree = apiAgree) {
    return f(url, "POST", data, header, agree);
  }
};