자바스크립트로 다운로드를 구현하는 방법

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 function commDownload1(url, params) {
     url += "?";
    for(let key in params) {
         url += key + "=" + params[key] + "&";
     }
     url = url.substr(0, url.length - 1);
     $("<a href=" + url + " />")[0].click();
 }

function commDownload2(url, params) {
     url += "?";
     for(let key in params) {
         url += key + "=" + params[key] + "&";
     }
    url = url.substr(0, url.length - 1);
    window.open(url);