uni-app网络请求封装

1. 未封装前index.vue页面使用

getMachineNum:function(){
    var timestamp = Date.parse(new Date());//时间戳
    var token = uni.getStorageSync(_self.sessionKey);
    var device = "wxapp";
    var ver = "1.1.30";
            
    uni.request({
        url: this.siteBaseUrl + 'machine/index',
        method: 'GET',
        data: {
            token : token,
            timestamp : timestamp,
            device : device,
            ver : ver
        },
        success: res => {
            console.log("getMachineNum success:" + JSON.stringify(res));
            if (res.data.code == "-1") {//登录失效
                uni.showToast({
                    title: res.data.msg,
                    mask: false,
                    duration: 1500
                });
            } else if (res.data.code == "0") {
                var data = res.data.data;
                _self.onlineNum = data.onlineNum;
                _self.machineNum = data.machineNum;
            }else {
                console.log("未处理的结果码");
            }
                    
        },
        fail: (e) => {
            console.log("getMachineNum fail:" + JSON.stringify(e));
        },
        complete: () => {}
    });
},

请求结果

{
  "data": {
    "code": "0",
    "msg": "success",
    "data": {
      "machineNum": 124,
      "onlineNum": 1,
      
    }
  },
  "header": {
    "Server": "nginx/1.14.0",
    "Date": "Thu, 11 Apr 2019 03:08:20 GMT",
    "Content-Type": "application/json;charset=utf-8;",
    "Transfer-Encoding": "chunked",
    "Connection": "keep-alive",
    "X-Powered-By": "PHP/7.1.16"
  },
  "statusCode": 200,
  "cookies": [],
  "errMsg": "request:ok"
}

2. main.js中封装网络请求

Vue.prototype.sendRequest= function(param,backpage, backtype){
    var _self = this, 
        url = param.url,
        data = param.data || {}, 
        header = param.header,
        token = "";
        
    //拼接完整请求地址
    var requestUrl = this.siteBaseUrl + url;
    //固定参数
    if(!data.token){//如果参数中无token(除了小程序第一次通过code获取token的接口默认参数token = login,其他接口token参数都是在本地缓存中获取)
        token = uni.getStorageSync(this.sessionKey);
        if(!token){//本地无token需重新登录
            _self.login(backpage, backtype);
            return;
        }else{
            data.token = token;
        }
    }
    var timestamp = Date.parse(new Date());//时间戳
    data["timestamp"] = timestamp;
    data["device"] = "wxapp";//data["device"] = "iosapp";
    data["ver"] = "1.1.30";//data["ver"] = "1.0.0";
    
    //GET或POST
    if(param.method){
        param.method = param.method.toUpperCase();//小写改为大写
    }
    
    //网络请求
    uni.request({
        url: requestUrl,
        method: param.method || "GET",
        header: header || {'content-type' : "application/json"},
        data: data,
        success: res => {
            console.log("网络请求success:" + JSON.stringify(res));
            if (res.statusCode && res.statusCode != 200) {//api错误
                uni.showModal({
                    content:"" + res.errMsg
                });
                return;
            }
            if (res.data.code) {//返回结果码code判断:0成功,1错误,-1未登录
                if (res.data.code == "-1") {
                    _self.login(backpage, backtype);
                    return;
                }
                if (res.data.code != "0") {
                    uni.showModal({
                        showCancel:false,
                        content:"" + res.data.msg
                    });
                    return;
                }
            } else{
                uni.showModal({
                    showCancel:false,
                    content:"" + res.data.msg
                });
                return;
            }
            
            typeof param.success == "function" && param.success(res.data);
        },
        fail: (e) => {
            console.log("网络请求fail:" + JSON.stringify(e));
            uni.showModal({
                content:"" + res.errMsg
            });
            
            typeof param.fail == "function" && param.fail(res.data);
        },
        complete: () => {
            console.log("网络请求complete");
            uni.hideLoading();
            
            typeof param.complete == "function" && param.complete(res.data);
            return;
        }
    });
}

Vue.prototype.login = function(backpage, backtype){
    var _self = this;
    uni.login({
        success:function(res){
            _self.requestData({
                url : "user/login",
                data : {
                    code : res.code, 
                    token : "login"
                },
                success : function(res2){
                    if (res2.data.errCode == "0") {//用户存在:存储token
                        uni.setStorageSync(_self.sessionKey,res2.data.token);
                    } else if (res2.data.errCode == "0") {//用户不存在:调转到绑定页面
                        uni.redirectTo({url:'../binding/binding?backpage='+backpage+'&backtype='+backtype});
                        return false;
                    }
                }
            },backpage, backtype)
        },
        fail:function(e){
            console.log("微信login接口调用失败:" + JSON.stringify(e));
        }
    });
    return;
}


Vue.prototype.siteBaseUrl = 'https://api.uchat.com.cn/';

Vue.prototype.sessionKey = "sess_jk";

3. 封装后index.vue页面get请求调用

getMachineNum:function(){
    this.sendRequest({
        url : "machine/index",
        success : function(res){
            console.log("getMachineNum success:" + JSON.stringify(res));
            var data = res.data;
            _self.onlineNum = data.onlineNum || 0;
            _self.machineNum = data.machineNum || 0;
        },
        fail:function(e){
            console.log("getMachineNum  fail:" + JSON.stringify(e));
        }
    },'../myhome/myhome','2')
}

注意：页面POST请求header需配置为 {'content-type' : "application/x-www-form-urlencoded"}，如：

initData:function () {
    this.sendRequest({
        url : "CompanyTeam/teamInfo",
        data : {ct_id : ct_id},
        method : "POST",
        header: {'content-type' : "application/x-www-form-urlencoded"},
        success:function (res) {
            console.log("获取数据:" + JSON.stringify(res));
        }
    },"/pages/machineGroupOutput/machineGroupOutput","1")
},

故，可对网络请求封装继续优化。

4. 网络请求封装优化

Vue.prototype.sendRequest = function(param,backpage, backtype){
    var _self = this, 
        url = param.url,
        method = param.method,
        header = {},
        data = param.data || {}, 
        token = "";
        
    //拼接完整请求地址
    var requestUrl = this.siteBaseUrl + url;
    //固定参数:仅仅在小程序绑定页面通过code获取token的接口默认传递了参数token = login
    if(!data.token){//其他业务接口传递过来的参数中无token
        token = uni.getStorageSync(this.sessionKey);//参数中无token时在本地缓存中获取
        console.log("当前token:" + token);
        if(!token){//本地无token需重新登录(退出时清缓存token)
            _self.login(backpage, backtype);
            return;
        }else{
            data.token = token;
        }
    }
    var timestamp = Date.parse(new Date());//时间戳
    data["timestamp"] = timestamp;
    // #ifdef MP-WEIXIN
    data["device"] = "wxapp";
    data["ver"] = "1.1.30";
    // #endif
    // #ifdef APP-PLUS || H5
    data["device"] = "iosapp";
    data["ver"] = "1.0.0";
    // #endif
    
    //请求方式:GET或POST(POST需配置header: {'content-type' : "application/x-www-form-urlencoded"},)
    if(method){
        method = method.toUpperCase();//小写改为大写
        if(method=="POST"){
            header = {'content-type' : "application/x-www-form-urlencoded"};
        }else{
            header = {'content-type' : "application/json"};
        }
    }else{
        method = "GET";
        header = {'content-type' : "application/json"};
    }
    //用户交互:加载圈
    if (!param.hideLoading) {
        uni.showLoading({title:'加载中...'});
    }
    
    console.log("网络请求start");
    //网络请求
    uni.request({
        url: requestUrl,
        method: method,
        header: header,
        data: data,
        success: res => {
            console.log("网络请求success:" + JSON.stringify(res));
            if (res.statusCode && res.statusCode != 200) {//api错误
                uni.showModal({
                    content:"" + res.errMsg
                });
                return;
            }
            if (res.data.code) {//返回结果码code判断:0成功,1错误,-1未登录(未绑定/失效/被解绑)
                if (res.data.code == "-1") {
                    _self.login(backpage, backtype);
                    return;
                }
                if (res.data.code != "0") {
                    uni.showModal({
                        showCancel:false,
                        content:"" + res.data.msg
                    });
                    return;
                }
            } else{
                uni.showModal({
                    showCancel:false,
                    content:"No ResultCode:" + res.data.msg
                });
                return;
            }
            typeof param.success == "function" && param.success(res.data);
        },
        fail: (e) => {
            console.log("网络请求fail:" + JSON.stringify(e));
            uni.showModal({
                content:"" + e.errMsg
            });
            typeof param.fail == "function" && param.fail(e.data);
        },
        complete: () => {
            console.log("网络请求complete");
            uni.hideLoading();
            typeof param.complete == "function" && param.complete();
            return;
        }
    });
}

页面POST请求调用

initData:function () {
    this.sendRequest({
        url : "CompanyTeam/teamInfo",
        data : {ct_id : ct_id},
        method : "POST",
        success:function (res) {
            console.log("获取数据:" + JSON.stringify(res));
        }
    },"/pages/machineGroupOutput/machineGroupOutput","1")
},

拓展：设置网络请求为同步可参考Promise 封装。大致可分为三种方案：请求嵌套(异步方式的成功回调里获取数据后再采用异步方式请求)、promise 或者await，具体实现可自行实践，这里不详细叙述。