Simple implementation of saveAs from the withdrawn HTML5 FileSaver API. It's a baby version of eligrey/FileSaver.js.

saveAs( blob, filename )

function saveAs( blob, name ) {
    "use strict";
    
    // Inspired by Syntax: http://stackoverflow.com/questions/23451726/saving-binary-data-as-file-using-javascript-from-a-browser/23451803#23451803
    // Initially created to work around a bug in eligray/FileSaver.js
    // which prevented saving multiple files
    // (Issue 165: https://github.com/eligrey/FileSaver.js/issues/165 ).
    
    // Create a hidden `a` element.
    var a = document.createElement("a");
    document.body.appendChild(a);
    a.style.cssText = "display: none";
    
    // createObjectURL() will leak memory.
    var url = window.URL.createObjectURL(blob);
    a.href = url;
    a.download = name;
    a.click();
    window.URL.revokeObjectURL(url);
    a.parentNode.removeChild(a);
}