谁能解释为什么渐变不适用于下面的地图?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Riks.txt - Google Fusion Tables</title>
<style type="text/css">
html, body, #map_canvas {
margin: 0;
padding: 0;
height: 100%;
}
</style>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?v=3.7&sensor=false">
</script>
<script type="text/javascript">
function initialize()
{
map = new google.maps.Map
(document.getElementById('map_canvas'),
{
center: new google.maps.LatLng(59.53726545292721,18.12209266712103),
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
layer = new google.maps.FusionTablesLayer({
map: map,
heatmap: { enabled: false },
query: {
select: "MP",
from: "1TlGuMJwdZy-75LQvyEEq6GrvDob2LRREWI60Ji4",
where: ""
},
styles: [
{
styleId: 2,
polygonOptions: {
fillOpacity: 1,
fillColorStyler: {
expression: "MP",
min: 0,
max: 100,
gradient: ['#0000ff', '#00ffff', '#00ff00', '#ffff00', '#ff0000']
},
strokeWeight: 1,
strokeOpacity: 0.3,
strokeColor: '#000000'
}
}
]
});
layer.setOptions({
styleId: 2,
templateId: 0
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script></head>
<body><div id="map_canvas"></div></body></html>