封装微信小程序http拦截器过程解析

const Request = require("/utils/request");//导入模块
Request.post("/api/xcxWxLogin", { //调用方法
     code: res.code,
     encryptedData: resp.encryptedData,
     iv: resp.iv,
     shareId: share.shareId || "",
     salesmanId: share.salesmanId || "",
     source: share.source || ""
}).then(res => { //成功回调
  //todo
}).catch(err => {}); //异常回调

const apiHttp = "https://*****.com";
const socketHttp = "wss://*****.com/wss";
function fun(url, method, data, header) {
data = data || {};
header = header || {};
let sessionId = wx.getStorageSync("UserSessionId");
if (sessionId) {
if (!header || !header["SESSIONID"]) {
 header["SESSIONID"] = sessionId;
}
}
wx.showNavigationBarLoading();
let promise = new Promise(function(resolve, reject) {
wx.request({
 url: apiHttp + url,
 header: header,
 data: data,
 method: method,
 success: function(res) {
  if (typeof res.data === "object") {
   if (res.data.status) {
    if (res.data.status === -200) {
     wx.showToast({
      title: "为确保能向您提供最准确的服务，请退出应用重新授权",
      icon: "none"
     });
     reject("请重新登录");
    } else if (res.data.status === -201) {
     wx.showToast({

      title: res.data.msg,
      icon: "none"
     });
     setTimeout(function() {
      wx.navigateTo({
       url: "/pages/user/supplement/supplement"
      });
     }, 1000);
     reject(res.data.msg);
    }
   }
  }
  resolve(res);
 },
 fail: reject,
 complete: function() {
  wx.hideNavigationBarLoading();
 }
});

});
return promise;
}
function upload(url, name, filePath) {
let header = {};
let sessionId = wx.getStorageSync("UserSessionId"); //从缓存中拿该信息
if (sessionId) {
if (!header || !header["SESSIONID"]) {
 header["SESSIONID"] = sessionId; //添加到请求头中
}
}
wx.showNavigationBarLoading();
let promise = new Promise(function(resolve, reject) {
wx.uploadFile({
 url: apiHttp + url,
 filePath: filePath,
 name: name,
 header: header,
 success: function(res) {
  resolve(res);
 },
 fail: reject,
 complete: function() {
  wx.hideNavigationBarLoading();
 }
});
});
return promise;
}
module.exports = {
apiHttp: apiHttp,
socketHttp: socketHttp,
"get": function(url, data, header) {
return fun(url, "GET", data, header);
},
"post": function(url, data, header) {
return fun(url, "POST", data, header);
},
upload: function(url, name, filePath) {
return upload(url, name, filePath);
}
};