为什么Google地图教程不能在我的电脑上运行？ [英] Why doesn't the google maps tutorial work on my pc?
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问题描述
<！DOCTYPE html>
< html>
< head>
< meta name =viewportcontent =initial-scale = 1.0，user-scalable = no>
< meta charset =utf-8>
< title> Google Maps JavaScript API v3示例：Circle Simple< / title>
< link href =/ maps / documentation / javascript / examples / default.css =stylesheet>
< script src =https://maps.googleapis.com/maps/api/js?sensor=false>< / script>
< script>
var citymap = {};
citymap ['chicago'] = {
center：new google.maps.LatLng（41.878113，-87.629798），
population：2842518
};
citymap ['newyork'] = {
center：new google.maps.LatLng（40.714352，-74.005973），
population：8143197
};
citymap ['losangeles'] = {
center：new google.maps.LatLng（34.052234，-118.243684），
population：3844829
}
var cityCircle;
函数initialize（）{
var mapOptions = {
zoom：4，
center：new google.maps.LatLng（37.09024，-95.712891），
mapTypeId：google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map（document.getElementById（map_canvas），
mapOptions）;
（城市地图中的var city）{
//构建城市地图中每个值的圆圈。我们将人口增加了20％。
var populationOptions = {
strokeColor：＃FF0000，
strokeOpacity：0.8，
strokeWeight：2，
fillColor：＃FF0000 ，
fillOpacity：0.35，
map：map，
center：citymap [city] .center，
radius：citymap [city] .population / 20
} ;
cityCircle = new google.maps.Circle（populationOptions）;
}
}
< / script>
< / head>
< body onload =initialize（）>
< div id =map_canvas>< / div>
< / body>
< / html>
解决方案
由于您直接从演示网站保存文件，您没有保存与其关联的CSS文件（/maps/documentation/javascript/examples/default.css）。所以你的地图没有宽度/高度。如果保存此文件并正确引用它，它应该可以正常工作。或者，您可以将CSS的位添加到您的html文件中：
<！DOCTYPE html>
< html>
< head>
< meta name =viewportcontent =initial-scale = 1.0，user-scalable = no>
< meta charset =utf-8>
< title> Google Maps JavaScript API v3示例：Circle Simple< / title>
< style type =text / css>
html，body {
height：100％;
保证金：0;
padding：0;
}
#map_canvas {
height：100％;
}
@media print {
html，body {
height：auto;
}
#map_canvas {
height：650px;
}
}
< / style>
< script src =https://maps.googleapis.com/maps/api/js?sensor=false>< / script>
< script>
//创建一个包含LatLng，人口的对象。
var citymap = {};
citymap ['chicago'] = {
center：new google.maps.LatLng（41.878113，-87.629798），
population：2842518
};
citymap ['newyork'] = {
center：new google.maps.LatLng（40.714352，-74.005973），
population：8143197
};
citymap ['losangeles'] = {
center：new google.maps.LatLng（34.052234，-118.243684），
population：3844829
}
var cityCircle;
函数initialize（）{
var mapOptions = {
zoom：4，
center：new google.maps.LatLng（37.09024，-95.712891），
mapTypeId：google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map（document.getElementById（'map_canvas'），
mapOptions）;
（城市地图中的var city）{
//构建城市地图中每个值的圆圈。我们将人口增加了20％。
var populationOptions = {
strokeColor：'＃FF0000'，
strokeOpacity：0.8，
strokeWeight：2，
fillColor：'＃FF0000 '，
fillOpacity：0.35，
map：map，
center：citymap [city] .center，
radius：citymap [city] .population / 20
} ;
cityCircle = new google.maps.Circle（populationOptions）;
}
}
< / script>
< / head>
< body onload =initialize（）>
< div id =map_canvas>< / div>
< / body>
< / html>
So I've downloaded a sample bit of code from the google developer website to play around with. The bit of code found below is exactly the same as the code found here. When I download the html and try to open it locally in chrome it doesn't show anything, it returns me a blank screen without any errors (firebug lite). I'm using a mac and I'm new at all this web dev stuff. Should I set up a localhost thing or am I completely missing something? Any help is greatly appreciated.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Google Maps JavaScript API v3 Example: Circle Simple</title>
<link href="/maps/documentation/javascript/examples/default.css" rel="stylesheet">
<script src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script>
var citymap = {};
citymap['chicago'] = {
center: new google.maps.LatLng(41.878113, -87.629798),
population: 2842518
};
citymap['newyork'] = {
center: new google.maps.LatLng(40.714352, -74.005973),
population: 8143197
};
citymap['losangeles'] = {
center: new google.maps.LatLng(34.052234, -118.243684),
population: 3844829
}
var cityCircle;
function initialize() {
var mapOptions = {
zoom: 4,
center: new google.maps.LatLng(37.09024, -95.712891),
mapTypeId: google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map(document.getElementById("map_canvas"),
mapOptions);
for (var city in citymap) {
// Construct the circle for each value in citymap. We scale population by 20.
var populationOptions = {
strokeColor: "#FF0000",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#FF0000",
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: citymap[city].population / 20
};
cityCircle = new google.maps.Circle(populationOptions);
}
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas"></div>
</body>
</html>
解决方案
Since you saved the file directly from the demo site, you did not save the CSS file associated with it (/maps/documentation/javascript/examples/default.css). So your map has no width/height to it. If you save this file and reference it properly it should work. Alternatively, you can just add the bit of css to your html file:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Google Maps JavaScript API v3 Example: Circle Simple</title>
<style type="text/css">
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map_canvas {
height: 100%;
}
@media print {
html, body {
height: auto;
}
#map_canvas {
height: 650px;
}
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script>
// Create an object containing LatLng, population.
var citymap = {};
citymap['chicago'] = {
center: new google.maps.LatLng(41.878113, -87.629798),
population: 2842518
};
citymap['newyork'] = {
center: new google.maps.LatLng(40.714352, -74.005973),
population: 8143197
};
citymap['losangeles'] = {
center: new google.maps.LatLng(34.052234, -118.243684),
population: 3844829
}
var cityCircle;
function initialize() {
var mapOptions = {
zoom: 4,
center: new google.maps.LatLng(37.09024, -95.712891),
mapTypeId: google.maps.MapTypeId.TERRAIN
};
var map = new google.maps.Map(document.getElementById('map_canvas'),
mapOptions);
for (var city in citymap) {
// Construct the circle for each value in citymap. We scale population by 20.
var populationOptions = {
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: citymap[city].population / 20
};
cityCircle = new google.maps.Circle(populationOptions);
}
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas"></div>
</body>
</html>
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