editormd.amd.js
function() {    
            var settings         = this.settings;
            var previewContainer = this.previewContainer;
            
            if (settings.previewCodeHighlight) 
            {
                previewContainer.find("pre").addClass("prettyprint linenums");
                
                if (typeof prettyPrint !== "undefined")
                {                    
                    prettyPrint();
                }
            }

            return this;
        }
function() {    
            var settings         = this.settings;
            var previewContainer = this.previewContainer;
            
            if (settings.previewCodeHighlight) 
            {
                previewContainer.find("pre").addClass("prettyprint linenums");
                
                if (typeof prettyPrint !== "undefined")
                {                    
                    prettyPrint();
                }
            }

            return this;
        }
高亮预览HTML的pre代码部分
highlight of preview codes

@returns {editormd}             返回editormd的实例对象