fix download bug in chrome 35.0.1916.114

src/adapter/saveto.js

@@ -35,6 +35,7 @@ KM.registerToolbarUI( 'saveto', function ( name ) {
         var a = document.createElement( 'a' );
         a.setAttribute( 'download', filename );
         a.setAttribute( 'href', url );
+        document.body.appendChild(a);
         var evt;
         try {
             evt = new MouseEvent( 'click' );
@@ -43,6 +44,7 @@ KM.registerToolbarUI( 'saveto', function ( name ) {
             evt.initEvent( 'click', true, true );
         }
         a.dispatchEvent( evt );
+        document.body.removeChild(a);
     }
 
     var ie_ver = function () {
@@ -63,14 +65,14 @@ KM.registerToolbarUI( 'saveto', function ( name ) {
         iframe.contentDocument.writeln( d );
         iframe.contentDocument.execCommand( 'saveas', '', filename );
     };
+
     comboboxWidget.on( 'comboboxselect', function ( evt, res ) {
         var data = me.exportData( res.value );
         var p = KityMinder.findProtocal( res.value );
         var filename = me.getMinderTitle() + p.fileExtension;
         if ( typeof ( data ) == 'string' ) {
-            var url = 'data:text/plain; utf-8,' + encodeURIComponent( data );
+            var url = 'data:' + (p.mineType || 'text/plain') + '; utf-8,' + encodeURIComponent( data );
             if ( ie_ver() > 0 ) {
-                //console.log( p.fileExtension );
                 if ( p.fileExtension === '.km' ) {
                     doSave( 'application/x-javascript', data, me.getMinderTitle() );
                 } else if ( p.fileExtension === '.svg' ) {

src/protocal/json.js

@@ -8,6 +8,7 @@ KityMinder.registerProtocal( 'json', function () {
 	return {
 		fileDescription: 'KityMinder',
 		fileExtension: '.km',
+        mineType: 'application/json',
 		encode: function ( json ) {
 			return JSON.stringify( json, filter );
 		},

src/protocal/plain.js

@@ -87,6 +87,7 @@ KityMinder.registerProtocal( "plain", function () {
 	return {
 		fileDescription: '大纲文本',
 		fileExtension: '.txt',
+        mineType: 'text/plain',
 		encode: function ( json ) {
 			return encode( json, 0 );
 		},

src/protocal/png.js

@@ -72,7 +72,7 @@ KityMinder.registerProtocal( "png", function () {
 
 			function generateDataUrl( canvas ) {
 				var url = canvas.toDataURL( 'png' );
-				return url.replace( 'image/png', 'image/octet-stream' );
+				return url;
 			}
 			loadImage( url, function () {
 				var svgImage = this;

src/protocal/svg.js

@@ -2,6 +2,7 @@ KityMinder.registerProtocal( "svg", function () {
 	return {
 		fileDescription: 'SVG 矢量图（暂不支持IE）',
 		fileExtension: '.svg',
+        mineType: 'image/svg+xml',
 		encode: function ( json, km ) {
 			// svg 含有   符号导出报错 Entity 'nbsp' not defined
 			return km.getPaper().container.innerHTML.replace( / /g, ' ' );