function(theme) {  
            var settings   = this.settings;  
            settings.editorTheme = theme;  
            
            if (theme !== "default")
            {
                editormd.loadCSS(settings.path + "codemirror/theme/" + settings.editorTheme);
            }
            
            this.cm.setOption("theme", theme);
            
            return this;
        }
function(theme) {  
            var settings   = this.settings;  
            settings.editorTheme = theme;  
            
            if (theme !== "default")
            {
                editormd.loadCSS(settings.path + "codemirror/theme/" + settings.editorTheme);
            }
            
            this.cm.setOption("theme", theme);
            
            return this;
        }
function ( theme ) { var settings = this . settings ; settings . editorTheme = theme ; if ( theme !== "default" ) { editormd . loadCSS ( settings . path + "codemirror/theme/" + settings . editorTheme ) ; } this . cm . setOption ( "theme" , theme ) ; return this ; }
设置 CodeMirror（编辑区）的主题
Setting CodeMirror (Editor area) theme

@returns {editormd}  返回editormd的实例对象
设置 CodeMirror（编辑区）的主题 Setting CodeMirror ( Editor area ) theme