Export excel from Extjs Grid
exporter.js:  /**  * allows for downloading of grid data (store) directly into excel  * Method: extracts data of gridPanel store, uses columnModel to construct XML excel document,  * converts to Base64, then loads everything into a data URL link.  *  * @author      Animal        *  */  /**  * base64 encode / decode  *  * @location    http://www.webtoolkit.info/  *  */  var Base64 = (function() {     // Private property     var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";      // Private method for UTF-8 encoding     function utf8Encode(string) {         string = string.replace(/\r\n/g,"\n");         var utftext = "";         for (var n = 0; n < string.length; n++) {             var c = string.charCodeAt(n);             if (c < 128) {                 utftext += String.fromCharCode(c);             }             else if((c > 127) && (c < 2048)) {                 utftext += String.fromCharCode((c >> 6)...