Question

我有一个小的距离和持续时间计算器，我想知道如何围绕我的最终数字，例如，而不是最终持续时间为7.433333333333334分钟或最终距离为3.604公里。我得到7分钟和4公里。

这是我目前的代码：

＆＃13;

<html>
	<head>
		<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
		<title>Distance Calculator</title>
		<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
		<style type="text/css">
			#map_canvas { 
				height: 50%;
				width: 100%;
			}
		</style>
		<script type="text/javascript">
		var directionDisplay;
		var directionsService = new google.maps.DirectionsService();
		var map;
		
		


		function initialize() {
			directionsDisplay = new google.maps.DirectionsRenderer();
			var perth = new google.maps.LatLng(-31.949766, 115.860928);
			var myOptions = {
				zoom:12,
				mapTypeId: google.maps.MapTypeId.ROADMAP,
				center: perth
			}

			map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
			directionsDisplay.setMap(map);
		}

		function calcRoute() {
			var start = document.getElementById("start").value;
			var end = document.getElementById("end").value;
			var distanceInput = document.getElementById("distance");
			var durationInput = document.getElementById("duration");
			
			
			var request = {
				origin:start, 
				destination:end,
				travelMode: google.maps.DirectionsTravelMode.DRIVING
			};
			
			directionsService.route(request, function(response, status) {
				if (status == google.maps.DirectionsStatus.OK) {
					directionsDisplay.setDirections(response);
					distanceInput.value = response.routes[0].legs[0].distance.value / 1000;
					durationInput.value = response.routes[0].legs[0].duration.value / 60;
					}
			});
		}
		
		function updateDue() {

    var total = parseInt(document.getElementById("odoend").value);
    var val2 = parseInt(document.getElementById("odostart").value);
    var val3 = parseInt(document.getElementById("distance").value);

    // to make sure that they are numbers
    if (!total) { total = 0; }
    if (!val2) { val2 = 0; }
    if (!val3) { val3 = 0; }

    var ansD = document.getElementById("kmused");
    ansD.value = total - val2;
   
    var ansE = document.getElementById("kmpriv");
    ansE.value = ansD.value - val3;
}
		</script>
	</head>
	<body onload="initialize()">
		<div>
			<p>
				<label for="start">Enter your current clients address:</label>
				<br>
				<input type="text" name="start" id="start" />
				<p>
				<label for="end">Enter your next clients address: </label>
				<br>
				<input type="text" name="end" id="end" />
				<p>
				<input type="submit" value="Calculate Route" onclick="calcRoute()" />
				</p>
				<label for="odostart">Enter start odometer reading: </label>
				<br>
    <input type="text" name="odostart" id="odostart" onchange="updateDue()">
				<p>
				<label for="odoend">Enter end odometer reading: </label>
				<br>
    <input type="text" name="odoend" id="odoend" onchange="updateDue()">
				<p>
				 <label for="kmused">Total KMs used</label><br>
    <input type="text" name="kmused" id="kmused">
				<p>
				<label for="kmpriv">Private KMs used</label><br>
    <input type="text" name="kmpriv" id="kmpriv">
				<p>
	
				<p>
				<label for="distance">Distance to next client (km): </label><br>
				<input type="text" name="distance" id="distance" onchange="updateDue()" />
				<p>
				<label for="duration">Duration to next client (min): </label><br>
				<input type="text" name="duration" id="duration" onchange="updateDue()" />
			</p>
			
		</div>
		<div id="map_canvas"></div>
	</body>
</html>

＆＃13;

Answer 1

我相信你要找的是Math.round()函数。

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