saveAs.js

// window.saveAs
// Shims the saveAs method, using saveBlob in IE10. 
// And for when Chrome and FireFox get round to implementing saveAs we have their vendor prefixes ready. 
// But otherwise this creates a object URL resource and opens it on an anchor tag which contains the "download" attribute (Chrome)
// ... or opens it in a new tab (FireFox)
// @author Andrew Dodson
// @copyright MIT, BSD. Free to clone, modify and distribute for commercial and personal use.

window.saveAs || ( window.saveAs = (window.navigator.msSaveBlob ? function(b,n){ return window.navigator.msSaveBlob(b,n); } : false) || window.webkitSaveAs || window.mozSaveAs || window.msSaveAs || (function(){

	// URL's
	window.URL || (window.URL = window.webkitURL);

	if(!window.URL){
		return false;
	}

	return function(blob,name){
		var url = URL.createObjectURL(blob);

		// Test for download link support
		if( "download" in document.createElement('a') ){

			var a = document.createElement('a');
			a.setAttribute('href', url);
			a.setAttribute('download', name);

			// Create Click event
			var clickEvent = document.createEvent ("MouseEvent");
			clickEvent.initMouseEvent ("click", true, true, window, 0, 
				event.screenX, event.screenY, event.clientX, event.clientY, 
				event.ctrlKey, event.altKey, event.shiftKey, event.metaKey, 
				0, null);

			// dispatch click event to simulate download
			a.dispatchEvent (clickEvent);

		}
		else{
			// fallover, open resource in new tab.
			window.open(url, '_blank', '');
		}
	};

})() );