我正在研究谷歌地圖。我需要繪制不同顏色的折線。這是我的代碼。var response = {    "points": [        [17.36603966, 78.45885158, 17.36608062, 78.46013904],        [17.36608062, 78.46013904, 17.36644926, 78.46131921],    ]};for (var i = 0; i < response.points.length; i++) {    directionsService.route({        'origin': response.points[i][0] + ',' + response.points[i][1],        'destination': response.points[i][2] + ',' + response.points[i][3],        'travelMode': 'DRIVING'    }, function (directions, status) {               directionsDisplay = new google.maps.DirectionsRenderer({            suppressInfoWindows: true,            suppressMarkers: true,            polylineOptions: {                strokeColor:'red'            },            map: mymapid        });               if (status == google.maps.DirectionsStatus.OK) {            directionsDisplay.setDirections(directions);        }    });};如何為我的積分添加動態(tài)顏色？