Book -MegaZine3 页码，15/20This attribute has no effect if all pages are stored in memory at the same time (see book@maxloadedattribute), as all thumbnails will be generated from the page content anyway.This feature is disabled per default for two reasons: it slightly diminishes performance until all thumbnails have been generated, and it is a potential waste of bandwidth. If deactivated only the required thumbnails will be generated, i.e. the thumbnails that should currently be displayed (e.g. when the user hovers a page button in the navigationbar). Generally pages only have to be loaded once to generate a thumbnail. If a page is unloaded (removed from memory) the last known thumbnail will be used.thumbloadtext ■ Type:String■ Default:?The text to display in thumbnails before they have been generated for the first time.thumbloadtextsize ■ Type:Number■ Default:autoWhen set, this parameter controls the size of the text in the page thumbnail of not yet loaded/generated thumbnails (see the thumbloadtextattribute). This is especially meant to be used in combination with thumbloadtext, to fit more text into the thumbnail.Note that the default size is calculated dynamically, based on the size of the thumbnail, to fit in the defaulttext(the question mark, ?), so it is not possible to generally say which font size is required to fit in more text / use the available space better (you will have to experiment).thumbmaxmem ■ Type:Integer■ Default:524288The maximum size a thumbnail for a single page side may have in memory. This is just meant as a 'emergency brake', in case users specify absurdly large pages. In this case it is preferred to control the size of the thumbnails using the book@thumbscaleattribute.Can be disabled by setting it to 0.thumbpath ■ Type:StringA path to a directory containing images which will be used as thumbnails for the pages. This can be used to speed up thumbnail loading, because not the actual page content has to be loaded, but only a small thumbnail graphic.The images should be sized (book@pagewidth* book@thumbscale)x(book@pageheight* book@thumbscale), i.e. per default a fourth of a page's size.http://www.megazine3.de/doc/Book 2013/9/3