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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>calc_AJAX.html</title>
<script type="text/javascript">
function loadXMLDoc(number1,number2)
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+,Firefox,Chrome,Opera,Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6,IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
var url="calc_AJAX_GET.php?num1="+number1+"&num2="+number2; //请求字符串
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
</script>
</head>
<body>
<form method="post" action="">
计算器<br>
数值1：<input type="text" id="num1" value="3"> <br>
数值2：<input type="text" id="num2" value="2"> <br>
<br>
<button type="button" name="add" value="+" onclick="loadXMLDoc(document.getElementById('num1').value,document.getElementById('num2').value)">+ </button>
<br>
结果：<br>
<div id="myDiv"><h3>Let AJAX change this text</h3></div>
</form>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>calc_AJAX_GET.php</title>
<meta charset="UTF-8">
</head>
<body>
<?php
$sum="";
$num1=isset($_GET['num1']) ? $_GET['num1'] : "";
$num2=isset($_GET['num2']) ? $_GET['num2'] : "";
if(is_numeric($num1) && is_numeric($num2)){
$sum=$num1+$num2;
}else{
echo "请输入有效数值";
exit(0);
} echo $sum; ?> </body> </html> （编辑：李大同）
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