save as

save as

      function saveAs(blob, filename) {
            var type = blob.type;
            var force_saveable_type = 'application/octet-stream';
            if (type && type != force_saveable_type) { // 强制下载，而非在浏览器中打开
                var slice = blob.slice || blob.webkitSlice;
                blob = slice.call(blob, 0, blob.size, force_saveable_type);
            }

            var url = URL.createObjectURL(blob);
            var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
            save_link.href = url;
            save_link.download = filename;

            var event = document.createEvent('MouseEvents');
            event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
            save_link.dispatchEvent(event);
            URL.revokeObjectURL(url);
         }

        var URL = URL || webkitURL || window;
        var bb = new Blob([JSON.stringify($scope.maps, null, '\t')], {type: 'text/json'});
        saveAs(bb, 'ReResSetting.json');