我有一个带有可拖动导向地图的页面，我想插入一个按钮以保存使用HTML2Canvas的地图Div的屏幕。我有此代码：
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Draggable directions</title>
<style>
#right-panel {
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 10px;
}
#right-panel select, #right-panel input {
font-size: 15px;
}
#right-panel select {
width: 100%;
}
#right-panel i {
font-size: 12px;
}
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
float: left;
width: 63%;
height: 100%;
}
#right-panel {
float: right;
width: 34%;
height: 100%;
}
.panel {
height: 100%;
overflow: auto;
}
</style>
</head>
<body>
<div id="prova"></div>
<div id="map"></div>
<div id="right-panel">
<p>Total Distance: <span id="total"></span></p>
</div>
<script>
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: {lat: -24.345, lng: 134.46} // Australia.
});
var directionsService = new google.maps.DirectionsService;
var directionsDisplay = new google.maps.DirectionsRenderer({
draggable: true,
map: map,
panel: document.getElementById('right-panel')
});
directionsDisplay.addListener('directions_changed', function() {
computeTotalDistance(directionsDisplay.getDirections());
});
displayRoute('Perth, WA', 'Sydney, NSW', directionsService,
directionsDisplay);
}
function displayRoute(origin, destination, service, display) {
service.route({
origin: origin,
destination: destination,
waypoints: [{location: 'Adelaide, SA'}, {location: 'Broken Hill, NSW'}],
travelMode: 'DRIVING',
avoidTolls: true
}, function(response, status) {
if (status === 'OK') {
display.setDirections(response);
} else {
alert('Could not display directions due to: ' + status);
}
});
}
function computeTotalDistance(result) {
var total = 0;
var myroute = result.routes[0];
for (var i = 0; i < myroute.legs.length; i++) {
total += myroute.legs[i].distance.value;
}
total = total / 1000;
document.getElementById('total').innerHTML = total + ' km';
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCuW8LXNxEX76FBnWPHKH9ddSYkwAKiszM&callback=initMap">
</script>
</body>
</html>我如何使用HTML2Canvas？我尝试在脚本网站中使用示例代码，但它不起作用。
作为替代方案，您可以使用dom-to-image，它可以很好地工作：
https://github.com/tsayen/dom-to-image