概述: 我一直在处理一个项目,该项目接收来自外部源的消息,并根据接收到的信息更新Bing地图。但是,当我让页面运行很长时间时,页面最终会耗尽所有内存并崩溃。
具体问题: 当我从Google Maps切换到Bing Maps后,出现了内存问题,无论我尝试什么都无法解决。我已经搜索了所有相关资料,试图通过Bing Maps最佳实践来解决此问题,或者至少找到导致此问题的原因,但是我无法找到任何真正解决问题的方法。
我有大量的分离的DOM,并尝试使用Google Chrome的控制台更仔细地分析它们,但没有成功。
尝试修复:
- 将添加处理程序的所有内容移动到地图初始化函数中(如下所示),但似乎没有太多改进。
- 从地图初始化函数中加载任何Bing Maps模块(如下所示)。这样可以清理代码,但对内存使用似乎没有太大影响。
- 同步加载地图。但是,这似乎破坏了与Bing Maps相关的所有内容。
- 在接收到消息时停止处理地图。这有助于键使用,但对内存使用没有帮助。
相关代码:
这是地图初始化函数(由HTML中的Bing Maps调用异步运行):
function initialize () {
const CENTER = new Microsoft.Maps.Location(44.96375272262944, -93.2353971897461);
// Assigns the zoom depending on whether the device is a mobile device or not
if (isMobile()) {
zoom = 12;
} else {
zoom = 13;
}
// Initialize the map
map = new Microsoft.Maps.Map(document.getElementById('map-canvas'), {
credentials: API_KEY,
minZoom: zoom,
center: CENTER,
disableStreetside: true,
disableStreetsideAutoCoverage: true,
enableClickableLogo: false,
showLocateMeButton: false,
showMapTypeSelector: false
});
bus1 = {
assignment: null,
destination: null,
distance: null,
eta: null,
location: null,
mph: null,
name: null,
pin: new Microsoft.Maps.Pushpin(map.getCenter(), {
icon: 'img/bus1.png',
anchor: new Microsoft.Maps.Point(14, 44),
visible: false,
text: "",
title: ""
}),
polylineRender: null,
time: null,
timeout: null,
};
bus2 = {
assignment: null,
destination: null,
distance: null,
eta: null,
location: null,
mph: null,
name: null,
pin: new Microsoft.Maps.Pushpin(map.getCenter(), {
icon: 'img/bus2.png',
anchor: new Microsoft.Maps.Point(14, 44),
visible: false,
text: "",
title: ""
}),
polylineRender: null,
time: null,
timeout: null,
};
bus3 = {
assignment: null,
destination: null,
distance: null,
eta: null,
location: null,
mph: null,
name: null,
pin: new Microsoft.Maps.Pushpin(map.getCenter(), {
icon: 'img/bus3.png',
anchor: new Microsoft.Maps.Point(14, 44),
visible: false,
text: "",
title: ""
}),
polylineRender: null,
time: null,
timeout: null,
};
buses = [bus1, bus2, bus3];
// Add the traffic layer
Microsoft.Maps.loadModule('Microsoft.Maps.Traffic', function () {
trafficLayer = new Microsoft.Maps.Traffic.TrafficManager(map);
});
// Add the directions manager
Microsoft.Maps.loadModule('Microsoft.Maps.Directions', function () {
bus1.polylineRender = new Microsoft.Maps.Directions.DirectionsManager(map);
bus2.polylineRender = new Microsoft.Maps.Directions.DirectionsManager(map);
bus3.polylineRender = new Microsoft.Maps.Directions.DirectionsManager(map);
Microsoft.Maps.Events.addHandler(bus1.polylineRender, 'directionsError', function (e) {
console.log("Error: " + e.message + "\r\nResponse Code: " + e.responseCode);
});
Microsoft.Maps.Events.addHandler(bus1.polylineRender, 'directionsUpdated', directionsUpdated);
Microsoft.Maps.Events.addHandler(bus2.polylineRender, 'directionsError', function (e) {
console.log("Error: " + e.message + "\r\nResponse Code: " + e.responseCode);
});
Microsoft.Maps.Events.addHandler(bus2.polylineRender, 'directionsUpdated', directionsUpdated);
Microsoft.Maps.Events.addHandler(bus3.polylineRender, 'directionsError', function (e) {
console.log("Error: " + e.message + "\r\nResponse Code: " + e.responseCode);
});
Microsoft.Maps.Events.addHandler(bus3.polylineRender, 'directionsUpdated', directionsUpdated);
});
// Defines the polygons surrounding each campus
polygonArrSTP = [
new Microsoft.Maps.Location(44.94619673931851, -93.19240808486938),
new Microsoft.Maps.Location(44.941321471037966, -93.19249391555786),
new Microsoft.Maps.Location(44.94130628263941, -93.19764375686646),
new Microsoft.Maps.Location(44.93790398010943, -93.1975257396698),
new Microsoft.Maps.Location(44.937926764055824, -93.1924831867218),
new Microsoft.Maps.Location(44.94164802063501, -93.19241881370544),
new Microsoft.Maps.Location(44.94164802063501, -93.18739771842957),
new Microsoft.Maps.Location(44.94618914576464, -93.18735480308533),
new Microsoft.Maps.Location(44.94618914576464, -93.1924295425415),
];
polygonArrMPLS = [
new Microsoft.Maps.Location(44.97380025938377, -93.2795798778534),
new Microsoft.Maps.Location(44.97295018417148, -93.27883958816528),
new Microsoft.Maps.Location(44.97264658282772, -93.27782034873962),
new Microsoft.Maps.Location(44.973595331690625, -93.27698349952698),
new Microsoft.Maps.Location(44.9745744240603, -93.27614665031433),
new Microsoft.Maps.Location(44.97501463068608, -93.27712297439575),
new Microsoft.Maps.Location(44.9747205274961, -93.27738046646118),
new Microsoft.Maps.Location(44.974339139822895, -93.27832460403442),
new Microsoft.Maps.Location(44.97380025938377, -93.2795798778534)
];
// Adds the campus polygons to the map
polygonMPLS = new Microsoft.Maps.Polygon(polygonArrMPLS, {
fillColor: "rgba(255, 0, 0, 0.4)",
strokeColor: '#FF0000',
strokeThickness: 2
});
polygonSTP = new Microsoft.Maps.Polygon(polygonArrSTP, {
fillColor: "rgba(255, 0, 0, 0.4)",
strokeColor: '#FF0000',
strokeThickness: 2
});
// Assign the polygons to the Map
map.entities.push(polygonMPLS);
map.entities.push(polygonSTP);
// Set the toggle for advanced mode
advancedModeEnabled = false;
generateBusStats();
subscribeToPubnub();
console.log("Initialization complete.");
}
这是在接收到消息时运行的函数:
以下是收到消息时运行的函数:
function redraw(payload) {
// If the user is does not have the page active, the payload is refused
if (!acceptingPayloads) {
return false;
}
let location = new Microsoft.Maps.Location(payload.message.lat, payload.message.lng);
let name = payload.message.name;
let dest = payload.message.dest;
let mph = payload.message.mph;
const STP = new Microsoft.Maps.Location(44.9416428, -93.1917952);
const MPLS = new Microsoft.Maps.Location(44.9747502, -93.2774464);
if (dest.toUpperCase() === "S") {
dest = {letter: "S", name: "St. Paul", coords: STP};
} else if (dest.toUpperCase() === "M") {
dest = {letter: "M", name: "Minneapolis", coords: MPLS};
} else {
dest = null;
}
console.log(name + ": " + location.latitude + ", " + location.longitude + " - " + dest.name + " - " + mph + " mph");
// Gets the bus object that the payload was sent from
currentBus = getCurrentBus(name);
// Removes the timeout for the current bus
if (currentBus.timeout !== null) {
clearTimeout(currentBus.timeout);
}
currentBus.location = location;
currentBus.destination = dest;
currentBus.mph = mph;
currentBus.time = Date.now();
currentBus.name = name;
// Restart the timeout for the current bus
beginTimeout();
// Calculate the distance between the current bus and its destination
calcDistToDest();
$("." + currentBus.assignment + "-item").css('display', 'block')
}
最后,这里是我用来获取点之间距离的函数:
function calcDistToDest() {
// Clear all information from the Directions Manager
currentBus.polylineRender.clearAll();
// Set Route Mode to driving and the render options
currentBus.polylineRender.setRequestOptions({
routeMode: Microsoft.Maps.Directions.RouteMode.driving
});
currentBus.polylineRender.setRenderOptions({
autoUpdateMapView: false,
drivingPolylineOptions: {
visible: POLYLINE_VISIBILITY
},
waypointPushpinOptions: {
visible: false
},
firstWaypointPushpinOptions: {
anchor: currentBus.pin.getAnchor(),
icon: currentBus.pin.getIcon(),
title: currentBus.pin.getTitle(),
text: currentBus.pin.getText()
}
});
// Sets the waypoint of the bus's current position and destination
currentBus.polylineRender.addWaypoint( new Microsoft.Maps.Directions.Waypoint({
location: currentBus.location
}));
currentBus.polylineRender.addWaypoint( new Microsoft.Maps.Directions.Waypoint({
location: currentBus.destination.coords
}));
// Calculate the directions
currentBus.polylineRender.calculateDirections();
}
我需要找到导致这个问题的原因,如果问题很简单,只是我漏掉了一些明显的东西,那么我需要一个实际的解决方案,或者最佳实践来避免这个问题。
注意: 对于发布如此多的代码,我深感抱歉。由于我不知道哪一部分代码导致了这个问题,所以很难确定要发布哪些代码。如果需要修改或需要其他信息,请告诉我,我会尽力配合。此外,我还省略了同一文件中许多看似无关紧要的JS代码,如果需要,我可以添加它们。