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给出两个点的座标可计算出两点间直线距离

2011-07-13 11:14 369 查看


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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>给出两个点的座标可计算出两点间直线距离</title>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function distance(form) {
var x1 = eval(form.x1.value);
var y1 = eval(form.y1.value);
var x2 = eval(form.x2.value);
var y2 = eval(form.y2.value);
var xdiff = x2 - x1;
var ydiff = y2 - y1;
form.answer.value = Math.pow((xdiff * xdiff + ydiff * ydiff), 0.5);
}
//  End -->
</script>
</head>

<body>
<center>
<form>
<table border=3 cellspacing=2 cellpadding=5>
<tr>
        <td colspan=4 align=center height="18">求两点的直线距离</td>
</tr>
<tr>
        <td colspan=2 align=center>点 A 座标</td>
        <td colspan=2 align=center>点 B 座标</td>
</tr>
<tr>
        <td align=center>X 轴</td>
        <td align=center>Y 轴</td>
        <td align=center>X 轴</td>
        <td align=center>Y 轴</td>
</tr>
<tr>
<td align=center><input type=text name=x1 size=5></td>
<td align=center><input type=text name=y1 size=5></td>
<td align=center><input type=text name=x2 size=5></td>
<td align=center><input type=text name=y2 size=5></td>
</tr>
<tr>
<td colspan=4 align=center>
          <input type=button value="得到结果" onClick="distance(this.form)">
        </td>
</tr>
<tr>
<td colspan=4 align=center><input type=text name=answer size=20></td>
</tr>
</table>
</form>
</center>
</body>
</html>
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