Default Example

HTML

<div id="map" style="height:500px"></div>

JavaScript

// create map and polyline
var map, polyline;

map = new google.maps.Map(document.getElementById("map"), {
  zoom: 15,
  center: new google.maps.LatLng(40.77333,-73.9723),
  mapTypeId: google.maps.MapTypeId.ROADMAP
});

polyline = new google.maps.Polyline({
  map: map,
  path: [  
    new google.maps.LatLng(40.77153,-73.97722),
    new google.maps.LatLng(40.77803,-73.96657)
  ]
});

polyline.edit();