1.请求方式post，请求函数参数

_requestData(callback,_cityDt){            const switchIp = "http://192.168.43.103/api/proxy";    let formData = new FormData();        formData.append("type","get");        formData.append("open_redis",1);        formData.append("redis_time",0);    fetch(switchIp, {            method:"POST",                  body:formData           }).then(            (response)=>{                if(response.ok){                    return response.json()                }else{                    return Promise.reject({                        status: response.status,                        statusText: response.statusText                    })                }            })            .then((responseJsonData)=> {                callback && callback(responseJsonData);            }).catch((error)=> {                console.log("getWatchHistory error " + error);            });    }

let _cityDt = “beijing”;  //需要传递的参数，不需要不传this._requestData((data)=>{    const res = JSON.parse(data);    //执行数据的处理相关操作    ........    //执行初始化数据的操作        this._initData();},_cityDt)

2.get请求

_requestData(callback,_id){         const url = `http://192.114.90.121/data/api/trend?evt=${_id}`;     fetch(url, {}).then(            (response)=>{            if(response.ok){                return response.json()            }else{                return Promise.reject({                    status: response.status,                    statusText: response.statusText            })         }    }).then((responseJsonData)=> {                callback && callback(responseJsonData);            }).catch((error)=> {                console.log("getWatchHistory error " + error);            });    }

 

let _id = "123";this._requestData((data)=>{　 //执行数据渲染的函数    this._play(data)},_id)