对象序列化成字符串，拼接在请求url后面

http://m.vgcool.cn:10002/api/commodity/GetProductPageList?appId=570&rows=36&page=1&timeStr=1529066356956

http://m.vgcool.cn:10002/api/commodity/GetProductPageList

const params = {
    goodsType: ‘aaa‘,
    goodsName: ‘bbb‘,
    ordStatus: 0,
    page: 1,
    rows: 15
};

function addQueryString(params) {
    let paramsData = ‘‘;
    for (var Key in params) {
        paramsData += ‘?‘ + Key + ‘=‘ + params[Key] + ‘&‘;
    }
    return paramsData;
}