js動態修改瀏覽器ico圖標

function change_icon() {
            const changeFavicon = link => {
                let $favicon = document.querySelector('link[rel="icon"]');
                if ($favicon !== null) {
                    $favicon.href = link;
                } else {
                    $favicon = document.createElement("link");
                    $favicon.rel = "icon";
                    $favicon.href = link;
                    document.head.appendChild($favicon);
                }
            };
            // 設置圖標地址
            let iconUrl = `./icoImg/1.ico`
            // 動態修改網站圖標
            changeFavicon(iconUrl); 
        }