editormd.amd.js
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