Try this.

var polyline = new google.maps.Polyline({
        path: paths,
        strokeColor: "#FF0000",
        strokeWeight: 10,
        map: map,
        zIndex: 100
});

google.maps.event.addListener(polyline, 'mouseover', function(event) {
        p1.setOptions({
                path: paths,
                strokeColor: "#00FF00",
                strokeWeight: 10,
                zIndex: 300
        });
});
google.maps.event.addListener(polyline, 'mouseout', function(event) {
        p1.setOptions({
                path: paths,
                strokeColor: "#FF0000",
                strokeWeight: 10,
                zIndex: 100
        });
});

On 7月10日, 上午1時06分, CSharp <[email protected]> wrote:
> Is it possible to put one polyline overlay overtop of the another
> polyline that overlaps it when a onmouseover event fires?  I tried to
> set the strokeOpacity to 1.0 and the zIndex to 900 and the line on the
> bottom seems to always mesh the color with the top one.
>
> You can see the example here (select Route 25 and 26 where the lines
> overlap in some sections):
>
> http://www.mentoreng.com/testing/public/map2.html

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