(html, js)將運算結果輸出成文字檔，最後顯示儲存

function saveTextAsFile(_fileName, _text) {
    var textFileAsBlob = new Blob([_text], {
        type: 'text/plain'
    });

    var downloadLink = document.createElement("a");
    downloadLink.download = _fileName;
    downloadLink.innerHTML = "Download File";
    if (window.webkitURL != null) {
        // Chrome allows the link to be clicked
        // without actually adding it to the DOM.

        // final
        downloadLink.href = window.webkitURL.createObjectURL(textFileAsBlob);
    } else {
        // Firefox requires the link to be added to the DOM
        // before it can be clicked.
        downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
        downloadLink.onclick = destroyClickedElement;
        downloadLink.style.display = "none";

        // final
        document.body.appendChild(downloadLink);
    }

    downloadLink.click();
}

function destroyClickedElement(event) {
    document.body.removeChild(event.target);
}