详解微信小程序网络请求接口封装实例

/**
  * 接口公共访问方法
  * @param {Object} urlPath 访问路径
  * @param {Object} params 访问参数（json格式）
  * @param {Object} requestCode 访问码，返回处理使用
  * @param {Object} onSuccess 成功回调
  * @param {Object} onErrorBefore 失败回调
  * @param {Object} onComplete 请求完成（不管成功或失败）回调
  * @param {Object} isVerify 是否验证重复提交
  * @param {Object} requestType 请求类型（默认POST）
  * @param {Object} retry 访问失败重新请求次数（默认1次）
  */
 webCall: function (urlPath, params, requestCode, onSuccess, onErrorBefore, onComplete, isVerify, requestType, retry) {
  var params = arguments[1] ? arguments[1] : {};
  //var requestCode = arguments[2] ? arguments[2] : 1;
  var onSuccess = arguments[3] ? arguments[3] : function () { };
  var onErrorBefore = arguments[4] ? arguments[4] : this.onError;
  var onComplete = arguments[5] ? arguments[5] : this.onComplete;
  var isVerify = arguments[6] ? arguments[6] : false;
  var requestType = arguments[7] ? arguments[7] : "POST";
  var retry = arguments[8] ? arguments[8] : 1;
  var that = this;

  //防止重复提交，相同请求间隔时间不能小于500毫秒
  var nowTime = new Date().getTime();
  if (this.requestCount[urlPath] && (nowTime - this.requestCount[urlPath]) < 500) {
   return;
  }
  this.requestCount[urlPath] = nowTime;
  //是否验证重复提交
  if (isVerify) {
   if (this.verifyCount[urlPath]) {
    return;
   }
   this.verifyCount[urlPath] = true; //重复验证开关开启
  }

  console.log("发起网络请求, 路径:" + (that.apiHost + urlPath) + ", 参数:" + JSON.stringify(params));
  wx.request({
   url: that.apiHost + urlPath,
   data: params,
   method: requestType, // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
   header: {
    'content-type': requestType == 'POST' ?
     'application/x-www-form-urlencoded' : 'application/json'
   }, // 设置请求的 header
   success: function (res) {
    console.log("返回结果：" + JSON.stringify(res.data));
    if (res.data) {
     if (res.data.statusCode == 200) { //访问成功
      onSuccess(res.data, requestCode);
     } else if (res.data.statusCode == 300000001) { // 未登录
      that.isLogin = false;
      onErrorBefore(0, res.data.message, requestCode);
     } else {
      onErrorBefore(0, res.data.message == null ? "请求失败 , 请重试" : res.data.message, requestCode);
     }
    } else {
     onErrorBefore(0, "请求失败 , 请重试", requestCode);
    }
   },
   fail: function (res) {
    retry--;
    console.log("网络访问失败：" + JSON.stringify(res));
    if (retry > 0) return that.webCall(urlPath, params, requestCode, onSuccess, onErrorBefore, onComplete, requestType, retry);
   },
   complete: function (res) {
    onComplete(requestCode);
    //请求完成后，2秒后重复验证的开关关闭
    if (isVerify) {
     setTimeout(function () {
      that.verifyCount[urlPath] = false;
     }, 2000);
    }
   }
  })
 }

 complete: function (res) {
    onComplete(requestCode);
    //请求完成后，2秒后重复验证的开关关闭
    if (isVerify) {
     setTimeout(function () {
      that.verifyCount[urlPath] = false;
     }, 2000);
    }
   }
  })

 // 请求 home banner 数据
  wx.showNavigationBarLoading();
  app.webCall("/app/homeBanner", {}, QUERY_BANNER, this.onSuccess, this.onErrorBefore, this.onComplete);

 /**
  * 接口访问成功返回
  * @param {Object} data
  * @param {Object} requestCode
  */
 onSuccess: function (data, requestCode) {
   var that = this;
  switch (requestCode) {
   case QUERY_BANNER:
    that.setData({ bannerData: (data ? data.data : []) });
    break;
  }

/**
  * 接口访问完成
  * @param {Object} resultCode
  */
 onComplete: function (resultCode) {
  console.log("home onComplete1");

  if (--mCurrentRequestNums <= 0) {
   wx.hideNavigationBarLoading();
  }
 }