绘制多条路线谷歌地图

我想根据Google中的路线服务绘制多条路线，代码如下

p/s:Data是我从json调用中获得的列表

for (i = 0; i < 20; i++) {
route = data[i];

start = new google.maps.LatLng(route.from_lat,route.from_lng);
end = new google.maps.LatLng(route.to_lat,route.to_lng);

var request = {
origin:start,
destination:end,
travelMode: google.maps.TravelMode.DRIVING
};

var rendererOptions = {
preserveViewport: true,         
suppressMarkers:true,
routeIndex:i
};


directionsDisplay = new google.maps.DirectionsRenderer(rendererOptions);                
directionsDisplay.setMap(map);

var directionsService = new google.maps.DirectionsService();
directionsService.route(request, function(result, status) {
    console.log(result);

if (status == google.maps.DirectionsStatus.OK) {
    directionsDisplay.setDirections(result);
}});

我似乎无法从论坛中找到很多相关信息，我最好的选择是获取所有单独的交通信息并使用折线再次绘制吗？另外，如何确保循环仅在 DirectionDisplay.setDirections 完成时继续进行？

问候， 安迪

每条路线都需要单独的 google.maps.DirectionsRenderer 对象。像这样的东西：

var routes = [{origin: ..., destination: ...}, {origin: ..., destination: ...}, {origin: ..., destination: ...}];
var rendererOptions = {
    preserveViewport: true,         
    suppressMarkers:true,
    routeIndex:i
};
var directionsService = new google.maps.DirectionsService();

routes.each(function(route){
    var request = {
        origin: route.origin,
        destination: route.destination,
        travelMode: google.maps.TravelMode.DRIVING
    };

    var directionsDisplay = new google.maps.DirectionsRenderer(rendererOptions);
    directionsDisplay.setMap(map);

    directionsService.route(request, function(result, status) {
        console.log(result);

        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(result);
        }
    });
});

我使用的是prototype.js，所以你的数组遍历方法可能会有所不同。