JavaScriptでデータをファイルとしてダウンロードさせる

downloadFile.js

function downloadFile() {
 var content="aaaa,bbbbb,ccccc";
 var blob = new Blob([ content ], { "type" : "text/csv"});
 var downLoadLink = document.createElement("a");
 downLoadLink.download ="test.csv";
 downLoadLink.href =  window.URL.createObjectURL(blob);
 downLoadLink.dataset.downloadurl = ["text/plain", downLoadLink.download, downLoadLink.href].join(":");
 downLoadLink.click();
}