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js代码--根据经纬度计算距离

2015-07-24 14:28 686 查看
原网页地址：http://www.storyday.com/wp-content/uploads/2008/09/latlung_dis.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head profile="http://gmpg.org/xfn/11">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>经纬度距离计算小工具</title>
<style>
body {
margin: 5px 0;
padding: 0;
font-size: 12px;
TEXT-ALIGN: center;
font-family: arial, helvetica, sans-serif;
TEXT-ALIGN: center;
background: #FFF;
}
HTML BODY {
TEXT-ALIGN: center;
}
div {
MARGIN: 0px auto;
font-family: arial, helvetica, sans-serif;
text-align: left;
}
#page, div.page {
width: 980px;
overflow: visible;
text-align: center;
}
#main {
float: left;
width: 73%;
text-align: left;
overflow: hidden;
}
#sidebar {
float: right;
width: 26%;
}
#main p {
line-height: 25px;
font-size: 14px;
}
a img {
border: 0;
}
p a img {
border: 1px solid #eee;
padding: 2px;
margin: 3px;
}

i.corner {
display: block;
}
i.corner i {
height: 1px;
display: block;
font-size: 1px;
overflow: hidden;
background-color: #FFFFFF;
}
i.corner i.l1 {
margin: 0 5px;
border-bottom: 1px solid #ced4ca;
}
i.corner i.l2, i.corner i.l3, i.corner i.l4, div.cbody {
margin: 0 3px;
border-left: 1px solid #ced4ca;
border-right: 1px solid #ced4ca;
background: #fff;
}
i.corner i.l3 {
margin: 0 2px;
}
i.corner i.l4 {
margin: 0 1px;
height: 1px;
}
i.corner i.l5 {
margin: 0 5px;
border-top: 1px solid #ced4ca;
height: 1px;
}
div.cbody {
padding: 0 8px;
margin: 0;
background: #fff;
text-align: left;
}
.panel {
width: 100%;
font-size: 12px;
margin: 5px 0;
}
div.cbody .detailentry, div.cbody h1 {
margin: 0;
padding: 0;
}
.cbody ul {
list-style: none;
}
#CodeLable, #revq, td {
font-weight: bold;
font-size: 18px;
}
td {
font-weight: normal;
}
td.lb {
text-align: right;
padding: 0 5px 0 0;
color: green;
width: 150px;
}
.warning {
background: red;
color: #fff;
padding: 2px;
float: left;
}
/* end of corner*/
</style>
<body>
<div id="page">
<div class="page">
<h2>度分秒 TO 小数点 转换</h2>
<div class="panel">
<i class="corner"><i class="l1"></i><i class="l2"></i><i class="l3"></i><i class="l4"></i></i>
<div class="cbody">
<div style="text-align:center;height:60px;">
<div style="float:left;color:green;font-weight:bold;font-size:14px;width:50px;" id="sign1">

</div>
<div style="float:left;">

<input type="text" id="deg" name="deg"  onKeyUp="Convert2Dec()" />
度
<input type="text" id="min" name="min"  onKeyUp="Convert2Dec()"/>
分
<input type="text" id="sec" name="sec"  onKeyUp="Convert2Dec()"/>
秒
<br />
<br />
=
<input type="text" id="deg2" name="deg2" onkeyup="Convert2Deg()" />
度
</div>
<div style="float:left;color:green;font-weight:bold;font-size:14px;width:50px;" id="sign2">

</div>
</div>
</div>
<i class="corner"><i class="l4"></i><i class="l3"></i><i class="l2"></i><i class="l5"></i></i>
</div>
<h2>经纬度距离计算</h2>
<div class="panel">
<i class="corner"><i class="l1"></i><i class="l2"></i><i class="l3"></i><i class="l4"></i></i>
<div class="cbody">
<div style="text-align:center;height:100px;">
<div style="text-align:left;float:left;margin-left:40px;">
A：纬度
<input type="text" name="lat1" id="lat1" onKeyUp="calDis()" />
经度
<input type="text" name="lng1" id="lng1"  onKeyUp="calDis()" />
<br />
<br />
B：纬度
<input type="text" name="lat2" id="lat2"  onKeyUp="calDis()" />
经度
<input type="text" name="lng2" id="lng2"  onKeyUp="calDis()" />
<br />
<br />
A-B：距离=
<input type="text" name="distance" id="distance" />
Km
</div>
<div class="warning" id="warning"></div>
</div>

</div>
<i class="corner"><i class="l4"></i><i class="l3"></i><i class="l2"></i><i class="l5"></i></i>
</div>

<SCRIPT LANGUAGE="JavaScript">
function getVal(obj) {
if (document.getElementById(obj) != null)
return document.getElementById(obj).value;
else
return 0;
}

function setVal(obj, val) {
if (document.getElementById(obj) != null)
document.getElementById(obj).value = val;

}

function Convert2Dec() {
var deg = Math.abs(getVal('deg'));
var min = Math.abs(getVal('min'));
var sec = Math.abs(getVal('sec'));
var deci = deg * 1 + (sec * 1 + min * 60 ) / 3600;
setVal("deg2", deci);
}

function Convert2Deg() {
var deci = Math.abs(getVal('deg2'));
var deci2 = deci + '';

if (deci2.indexOf('.') == -1) {
setVal("deg", deci);
return false;
}
deci = deci2.split(".");
setVal("deg", deci[0]);

//
deci[1] = "0." + deci[1];
var min_sec = deci[1] * 3600;
var min = Math.floor(min_sec / 60);
var sec = (min_sec - (min * 60 ) );

setVal("min", min);

setVal("sec", sec);

}

function hide(m) {
document.getElementById(m).style.display = "none";
return true;
}

function show(m) {
document.getElementById(m).style.display = "";
return true;
}

//private const double EARTH_RADIUS = 6378.137;
function rad(d) {
return d * Math.PI / 180.0;
}

function GetDistance(lat1, lng1, lat2, lng2) {
hide("warning");
if ((Math.abs(lat1) > 90  ) || (Math.abs(lat2) > 90 )) {
document.getElementById("warning").innerHTML = ("兄台，这哪里是纬度啊？分明是想忽悠我嘛");
show("warning");
return "耍我？拒绝计算！";
} else {
hide("warning");
}
if ((Math.abs(lng1) > 180  ) || (Math.abs(lng2) > 180 )) {

show("warning");
document.getElementById("warning").innerHTML = ("兄台，这哪里是经度啊？分明是想忽悠我嘛");
return "耍我？拒绝计算！";
} else {
hide("warning");
}
var radLat1 = rad(lat1);
var radLat2 = rad(lat2);
var a = radLat1 - radLat2;
var b = rad(lng1) - rad(lng2);
var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
s = s * 6378.137;
// EARTH_RADIUS;
s = Math.round(s * 10000) / 10000;
return s;
}

function calDis() {
var lat1 = document.getElementById("lat1").value * 1;
var lat2 = document.getElementById("lat2").value * 1;
var lng1 = document.getElementById("lng1").value * 1;
var lng2 = document.getElementById("lng2").value * 1;
var dis = GetDistance(lat1, lng1, lat2, lng2);
document.getElementById("distance").value = dis;

}
</SCRIPT>

<div style="text-align:Center">
This Tool is Powered by Cosbeta [china.cos(at)gmail.com]
</div>
</div>
</div>
</body>
</html>
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