javascript download file and save locally code example
Example 1: js download file from webserver
<iframe id="download_iframe" style="display:none;"></iframe>
<script>
document.getElementById('download_iframe').src = "/example/example.txt";
</script>
Example 2: how to set a var in js to be a download
var textToSave = 'this is a test';
var hiddenElement = document.createElement('a');
hiddenElement.href = 'data:attachment/text,' + encodeURI(textToSave);
hiddenElement.target = '_blank';
hiddenElement.download = 'myFile.txt';
hiddenElement.click();