Adobe Acrobat Professional和Adobe Reader都是Adobe公司的产品。前者用来编辑制作PDF文档，后者只能用来阅读PDF。令人郁闷的是Adobe Reader中虽然有书签这一项显示，却没有添加书签的功能。解决方法一是使用Adobe Acrobat Professional，另一个方法如下：
在http://www.pdfhacks.com/bookmark_page/bookmark_page.js-1.0.zip 上面下载一个javascript脚本文件，把这个文件放到Adobe/Acrobat 7.0/Reader/Javascripts目录下。如果忘记了Adobe的安装目录，可以运行Adobe Reader，然后使用process explorer查看进程对应的可执行文件路径。文件放好后，重新运行Adobe Reader，就可以在“视图”菜单项的下面发现四个新增的条项。这四个新增的条项就是那个javascript文件的效果，它们能够实现书签的功能。这个新增的书签功能自然是不能和Adobe Acrobat Professional中的书签功能相比，但对于阅读文档也足够了。
下面是那个javascript文件的内容：
// bookmark_page.js, ver. 1.0// visit: www.pdfhacks.com/bookmark_page/// use this delimiter for serializing our arrayvar bp_delim= '%#%#';function SaveData( data ) { // data is an array of arrays that needs // to be serialized and stored into a persistent // global string var ds= ''; for( ii= 0; ii< data.length; ++ii ) { for( jj= 0; jj< 3; ++jj ) { if( ii!= 0 || jj!= 0 ) ds+= bp_delim; ds+= data[ii][jj]; } } global.pdf_hacks_js_bookmarks= ds; global.setPersistent( "pdf_hacks_js_bookmarks", true );}function GetData() { // reverse of SaveData; return an array of arrays if( global.pdf_hacks_js_bookmarks== null ) { return new Array(0); } var flat= global.pdf_hacks_js_bookmarks.split( bp_delim ); var data= new Array(); for( ii= 0; ii< flat.length; ) { var record= new Array(); for( jj= 0; jj< 3 && ii< flat.length; ++ii, ++jj ) { record.push( flat[ii] ); } if( record.length== 3 ) { data.push( record ); } } return data;}function AddBookmark() { // query the user for a name, and then combine it with // the current PDF page to create a record; store this record var label= app.response( "Bookmark Name:", "Bookmark Name", "", false ); if( label!= null ) { var record= new Array(3); record[0]= label; record[1]= this.path; record[2]= this.pageNum; data= GetData(); data.push( record ); SaveData( data ); }}function ShowBookmarks() { // show a pop-up menu; this seems to only work when // a PDF is alreay in the viewer; var data= GetData(); var items= ''; for( ii= 0; ii< data.length; ++ii ) { if( ii!= 0 ) items+= ', '; items+= '"'+ ii+ ': '+ data[ii][0]+ '"'; } // assemble the command and the execute it with eval() var command= 'app.popUpMenu( '+ items+ ' );'; var selection= eval( command ); if( selection== null ) { return; // exit } // the user made a selection; parse out its index and use it // to access the bookmark record var index= 0; // toString() converts the String object to a string literal // eval() converts the string literal to a number index= eval( selection.substring( 0, selection.indexOf(':') ).toString() ); if( index< data.length ) { try { // the document must be 'disclosed' for us to have any access // to its properties, so we use these FirstPage NextPage calls // app.openDoc( data[index][1] ); app.execMenuItem( "FirstPage" ); for( ii= 0; ii< data[index][2]; ++ii ) { app.execMenuItem( "NextPage" ); } } catch( ee ) { var response= app.alert("Error trying to open the requested document./nShould I remove this bookmark?", 2, 2); if( response== 4 && index< data.length ) { data.splice( index, 1 ); SaveData( data ); } } }}function DropBookmark() { // modelled after ShowBookmarks() var data= GetData(); var items= ''; for( ii= 0; ii< data.length; ++ii ) { if( ii!= 0 ) items+= ', '; items+= '"'+ ii+ ': '+ data[ii][0]+ '"'; } var command= 'app.popUpMenu( '+ items+ ' );'; var selection= eval( command ); if( selection== null ) { return; // exit } var index= 0; index= eval( selection.substring( 0, selection.indexOf(':') ).toString() ); if( index< data.length ) { data.splice( index, 1 ); SaveData( data ); }}function ClearBookmarks() { if( app.alert("Are you sure you want to erase all bookmarks?", 2, 2 )== 4 ) { SaveData( new Array(0) ); }}app.addMenuItem( {cName: "-", // menu dividercParent: "View", // append to the View menucExec: "void(0);" } );app.addMenuItem( {cName: "Bookmark This Page &5",cParent: "View",cExec: "AddBookmark();",cEnable: "event.rc= (event.target != null);" } );app.addMenuItem( {cName: "Go To Bookmark &6",cParent: "View",cExec: "ShowBookmarks();",cEnable: "event.rc= (event.target != null);" } );app.addMenuItem( {cName: "Remove a Bookmark",cParent: "View",cExec: "DropBookmark();",cEnable: "event.rc= (event.target != null);" } );app.addMenuItem( {cName: "Clear Bookmarks",cParent: "View",cExec: "ClearBookmarks();",cEnable: "event.rc= true;" } );
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