javascript js原生ajax post请求实例

HTML代码：

注意：

 xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;");  //用POST的时候一定要有这句

<!DOCTYPE HTML>
<html>
<head>
	<meta http-equiv="content-type" content="text/html" />
	<meta name="author" content=" " />

	<title>无标题 1</title>
</head>

<body>

<button onclick="ajaxp()" name="ajax" value="AJax">AJAX</button>

</body>
</html>
<script>
var xmlhttp;
function ajaxp(){
 var str = "id=123";
send(str);

function send(arg) {
  CreateXMLHttpRequest();
  xmlhttp.onreadystatechange = callhandle;
  //xmlhttp.open("GET","Default.aspx?goback=yes&arg=" + arg,true);
  xmlhttp.open("POST", "ajax.php", true);
  xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;");  //用POST的时候一定要有这句
  xmlhttp.send(arg);

}

function CreateXMLHttpRequest() {
  if (window.ActiveXObject) {
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  }
  else if (window.XMLHttpRequest) {
    xmlhttp = new XMLHttpRequest();
  }
}

function callhandle() {
  if (xmlhttp.readyState == 4) {
    if (xmlhttp.status == 200) {
      alert(xmlhttp.responseText);
    }
  }
}
/////
}</script>

　PHP文件：

<?php
echo "i am a ajax data.". $_POST['id'];

?>

javascript js原生ajax post请求 实例

javascript js原生ajax post请求实例