一、GET请求

 static Get(url,param,success,failure){
        /**
            var param = {
            name:'abc',
            age:20
         }
        **/
        // 拼接参数
        if(param){
            var keys = Object.keys(param);
            var totalParam = '';
            keys.forEach((key,i)=>{
                var mark = '?';
                if (i > 0) {
                    mark = '&'
                }
                var value = param[key];
                totalParam += mark;
                totalParam = totalParam + key + '=' + value;
            })
            url = url + totalParam;
        }
        // 发送请求
        fetch(url)
            .then((response)=>response.json())
            .then((json)=>{
                // 请求成功,并且解析数据为json的时候调用
                if(success){
                    success(json);
                }
            })
            .catch((error)=>{
                if(failure){
                    failure(error);
                }
            })
    }

二、Post请求：

    // Post的数据格式
    static ParamType = {
        ParamTypeJSON:'application/json',
        ParamTypeURL:'application/x-www-form-urlencoded'
    }
   // 数据格式为URL:'application/x-www-form-urlencoded'
    static PostWithUrlParam(url,param,success,failure){
       this.Post(url,param,this.ParamType.ParamTypeURL,success,failure);
    }
    // 数据格式为JSON:'application/json'
    static PostWithJsonParam(url,param,success,failure){
        this.Post(url,param,this.ParamType.ParamTypeJSON,success,failure);
    }
    // 处理请求参数
    static resolveParam(param,paramType){
        // 没有参数,返回空
        if (!param) return '';
        if(paramType == 'application/json'){
            return JSON.stringify(param);
        } else if (paramType == 'application/x-www-form-urlencoded'){
            // 获取key
            var totalParam = '';
            var i = 0;
            for (key in param){
                var mark = '';
                if (i > 0){
                    mark = '&'
                }
                var value = param[key];
                //  name=abc&age=20
                totalParam += mark + key + '=' + value;
                i++;
            }
            return totalParam;
        }
    }

    static Post(url,param,paramType,success,failure){
        // 处理请求参数
        this.resolveParam(param,paramType);
        var body = JSON.stringify(param);
        // 定制请求
        var optionals = {
            method:'POST',
            headers:{
                'Content-Type':paramType
            },
            body:body
        }
        // 发送请求
        fetch(url,optionals)
            .then((response)=>response.json())
            .then((json)=>{
                if(success){
                    success(json);
                }
            })
            .catch((error)=>{
                if(failure){
                    failure(error);
                }
            })
    }