[js] .txt 파일 로컬 저장

function writeFile(fileName, text) {
var blob = new Blob([text], { type: 'text/plain' });

objURL = window.URL.createObjectURL(blob);

if (window.__Xr_objURL_forCreatingFile__) {
window.URL.revokeObjectURL(window.__Xr_objURL_forCreatingFile__);
}
window.__Xr_objURL_forCreatingFile__ = objURL;

var a = document.createElement('a');

a.download = fileName;
a.href = objURL;
a.click();
}