前言

微信小程序是數據驅動的應用，開發技術和vue、react和angular等mv*技術類似。在vue下可以用vue-resource、axios等模塊進行http請求，但是在微信小程序上，http請求只支持wx.request(OBJECT)，所以我們需要對wx.request進行封裝，實現http攔截器的功能。

第一步：創建一個request.js文件

第二步：確定http、upload和websocket前綴

第三步：封裝wx.request

在請求發出前處理http地址、請求頭和參數、在響應后解析返回值并做基本的邏輯判斷，重點是使用Promise對象。

第四步：導出模塊

第五步：使用request

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

第六步：攔截器完整代碼

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: "為確保能向您提供最準確的服務，請退出應用重新授權",      icon: "none"     });     reject("請重新登錄");    } 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"); //從緩存中拿該信息if (sessionId) {if (!header || !header["SESSIONID"]) { header["SESSIONID"] = sessionId; //添加到請求頭中}}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);}};