Arc gis api for js比例尺，书签

 1   var scalebar = new esri.dijit.Scalebar({
 2                 map: myMap,
 3                 // "dual" displays both miles and kilmometers
 4                 // "english" is the default, which displays miles
 5                 // use "metric" for kilometers
 6                 scalebarUnit: "dual"
 7             }, dojo.byId("scalebardiv"));
 8 
 9               Books = new esri.dijit.Bookmarks({
10                 map: myMap,
11                 editable: "true"
12             }, dojo.byId("bookmarks"));
13 
14             dojo.connect(button1, "click", addBook);
15 
16         }
17         function addBook() {
18 
19             var bookextent = myMap.extent;
20 
21             var bookmarkItem = new esri.dijit.BookmarkItem({
22                 "extent": bookextent,
23                 "name": "北京"
24             });
25             Books.addBookmark(bookmarkItem);
26         }