let els = document.getElementsByTagName('iframe');

                if(els.length > 0){

                    for(let i = 0;i < els.length; i++){

                        document.body.removeChild(els[i]);

                    }

                }

                let el = document.createElement('iframe');

                el.src = `${url}/region/exportCommodityData?regionId=${this.regionId}`;

                el.style.display = 'none';

                document.body.appendChild(el);

<a href="http://test.jk.cn?key=1" download="http://test.jk.cn?key=1">点击下载</a>

<a class="underline tx-ct arcore fs-14" href="http://test.kdkkf.cn/app/ARCore.apk">安卓ARCore安装</a>