微信小程序是数据驱动的应用，开发技术和vue、react和angular等mv*技术类似。在vue下可以用vue-resource、axios等模块进行http请求，但是在微信小程序上，http请求只支持wx.request(OBJECT)，所以我们需要对wx.request进行封装，实现http拦截器的功能。
第一步：创建一个request.js文件
第二步：确定http、upload和websocket前缀
第三步：封装wx.request
在请求发出前处理http地址、请求头和参数、在响应后解析返回值并做基本的逻辑判断，重点是使用Promise对象。
第四步：导出模块
第五步：使用request
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
第六步：拦截器完整代码
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);}
};