editormd.amd.js
function() {
            
            var editor           = this.editor;
            var preview          = this.preview;
            var toolbar          = this.toolbar;
            var settings         = this.settings;
            var previewContainer = this.previewContainer;
            var previewCloseBtn  = editor.find("." + this.classPrefix + "preview-close-btn");

            this.state.preview   = false;
            
            this.codeMirror.show();
            
            if (settings.toolbar) {
                toolbar.show();
            }
            
            preview[(settings.watch) ? "show" : "hide"]();
            
            previewCloseBtn.hide().unbind(editormd.mouseOrTouch("click", "touchend"));
                
            previewContainer.removeClass(this.classPrefix + "preview-active");
                
            if (settings.watch)
            {
                previewContainer.css("padding", "20px");
            }
            
            preview.css({ 
                background : null,
                position   : "absolute",
                width      : editor.width() / 2,
                height     : (settings.autoHeight && !this.state.fullscreen) ? "auto" : editor.height() - toolbar.height(),
                top        : (settings.toolbar)    ? toolbar.height() : 0
            });

            if (this.state.loaded)
            {
                $.proxy(settings.onpreviewed, this)();
            }
            
            return this;
        }
function() {
            
            var editor           = this.editor;
            var preview          = this.preview;
            var toolbar          = this.toolbar;
            var settings         = this.settings;
            var previewContainer = this.previewContainer;
            var previewCloseBtn  = editor.find("." + this.classPrefix + "preview-close-btn");

            this.state.preview   = false;
            
            this.codeMirror.show();
            
            if (settings.toolbar) {
                toolbar.show();
            }
            
            preview[(settings.watch) ? "show" : "hide"]();
            
            previewCloseBtn.hide().unbind(editormd.mouseOrTouch("click", "touchend"));
                
            previewContainer.removeClass(this.classPrefix + "preview-active");
                
            if (settings.watch)
            {
                previewContainer.css("padding", "20px");
            }
            
            preview.css({ 
                background : null,
                position   : "absolute",
                width      : editor.width() / 2,
                height     : (settings.autoHeight && !this.state.fullscreen) ? "auto" : editor.height() - toolbar.height(),
                top        : (settings.toolbar)    ? toolbar.height() : 0
            });

            if (this.state.loaded)
            {
                $.proxy(settings.onpreviewed, this)();
            }
            
            return this;
        }
显示编辑器部分，退出只预览HTML
Exit preview html state

@returns {editormd}         返回editormd的实例对象