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：
===================================代码开始================================
// bookmark_page.js, ver. 1.0
// visit: www.pdfhacks.com/bookmark_page/
// use this delimiter for serializing our array
var 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 divider
cParent: "View", // append to the View menu
cExec: "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;" } );
===================================代码结束================================