一、js：

  1. 要点：
  2. 完整代码：
<script>
	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(){
		console.log(xmlhttp.readyState)
		if(xmlhttp.readyState < 4){
			console.log('loading...')
		}else if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
			xmlDoc=xmlhttp.responseText;
			console.log(xmlDoc)
		}else{
		    console.log('fail...')
		    xmlhttp.abort()
		}
	}
	xmlhttp.open("POST",'test.php',true,'user','pwd');
	xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	xmlhttp.setRequestHeader('name', 'lee');
	xmlhttp.send(null);
</script>

二、php：

  1. 要点：
  2. 完整代码：
<?php
header('Access-Control-Allow-Origin:*');
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Allow-Methods:GET,PUT,POST,DELETE,OPTIONS');
header('Access-Control-Allow-Headers:WWW-Authenticate,Authorization,Set-Cookie,X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5, Content-Type, Date, X-Api-Version,name');
$header = apache_request_headers();
var_Dump($header['name']);exit;