var app = getApp();function request(url,postData,doSuccess,doFail,doComplete){   var host = getApp().conf.host;   wx.request({    url: host+url,    data:postData,    method: 'POST',     success: function(res){     if(typeof doSuccess == "function"){       doSuccess(res);     }    },    fail: function() {     if(typeof doFail == "function"){       doFail();     }    },    complete: function() {     if(typeof doComplete == "function"){       doComplete();     }    }   }); }}module.exports.request = request;