fixed IE bug

src/adapter/saveto.js

@@ -34,7 +34,11 @@ KM.registerToolbarUI( 'saveto', function ( name ) {
         var a = document.createElement( 'a' );
         a.setAttribute( 'download', filename );
         a.setAttribute( 'href', url );
-        a.dispatchEvent( new MouseEvent( 'click' ) );
+        try {
+            a.dispatchEvent( new MouseEvent( 'click' ) );
+        } catch ( error ) {
+            a.click();
+        }
     }
 
     comboboxWidget.on( 'comboboxselect', function ( evt, res ) {

src/core/minder.js

@@ -31,7 +31,6 @@ var Minder = KityMinder.Minder = kity.createClass( "KityMinder", {
 
         this._paper = new kity.Paper();
         this._paper.getNode().setAttribute( 'contenteditable', true );
-        this._paper.setStyle( 'font-family', 'Arial,MicrosoftYaHei,sans-serif' );
         this._paper.getNode().ondragstart = function ( e ) {
             e.preventDefault();
         };
@@ -42,6 +41,7 @@ var Minder = KityMinder.Minder = kity.createClass( "KityMinder", {
         this._root.setType( "root" );
         if ( this._options.renderTo ) {
             this.renderTo( this._options.renderTo );
+            this._paper.setStyle( 'font-family', 'Arial,Microsoft YaHei,sans-serif' );
         }
     },
     _addRenderContainer: function () {