如何使用谷歌地圖設置縮放

當我在地圖上有多個位置時，需要設置縮放以獲取所有位置。我正在使用google map api v3。如何使用谷歌地圖設置縮放

我使用的代碼如下

function initialize() { 
    var myLatlng = new google.maps.LatLng(20.798362600000000000, -156.331925299999970000); 

    var mapOptions = { 
     zoom: 10, 
     center: myLatlng, 
     mapTypeId: google.maps.MapTypeId.ROADMAP 
    }; 

    map = new google.maps.Map(document.getElementById('map-canvas'),mapOptions); 

    addMarker(21.29539299, -157.8258667,'2525 South King Street,Honolulu HI 96826','Down to Earth','wholesale','restaurant'); 
    addMarker(20.87521935, -156.68008423,'658 Front St, lahaina HI 96761','Veg Out','wholesale','restaurant'); 
    addMarker(20.73747253, -156.45561218,'1847 S Kihei Rd,kihei HI 96753','Rodeo Kihei','wholesale','retailer'); 
    addMarker(20.9165287, -156.38095093,'127 Hana Hwy,Paia HI 96779','Test User','wholesale','retailer'); 
    addMarker(21.29226112, -157.82328796,'2525 South King Street,Honolulu HI 96826','Some User','wholesale','both'); 
    addMarker(20.91534615, -156.38002014,'49 Baldwin Ave.,Paia HI 96779','Mana Foods 2','wholesale','retailer'); 
    addMarker(20.88739586, -156.4566803,'340 Hana Hwy,, HI,Kahului HI 96732','Alive and Well 2','wholesale','restaurant'); 

    //addMarker(, ,'','','delivery'); 
} 

google.maps.event.addDomListener(window, 'load', initialize);

來源

2013-10-03 bonjour