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;" } );