Script

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function saveAsFile(str, filename) {
    var hiddenElement = document.createElement('a');
    hiddenElement.href = 'data:attachment/text,' + encodeURI(str);
    hiddenElement.target = '_blank';
    hiddenElement.download = filename;
    hiddenElement.click();
}
 
var strdata = "Hello, world!";
saveAsFile(strdata, "output.txt");


Demo

click: download file


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