javascript与php使用json传递数据

1. javascript：

   <script>
   function loadDoc(file,async=true){
   if(window.XMLHttpRequest){  // code for IE7+, Firefox, Chrome, Opera, Safari
   xmlhttp=new XMLHttpRequest();
   }else{  // code for IE6, IE5
   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
   if(async === true){
   xmlhttp.onreadystatechange = function(){
       if(xmlhttp.readyState < 4){
           // 加载中
       }else if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
           // 成功
           xmlDoc=xmlhttp.responseText;
           return xmlDoc
       }else{
           // 失败
           xmlhttp.abort()
           return
       }
   }
   }
   xmlhttp.open("POST",file,async);
   xmlhttp.setRequestHeader("Content-type", "application/json");
   var data = {
   name:'lee'
   }
   var json = JSON.stringify(data)
   xmlhttp.send(json);
   if(async === false){
   xmlDoc=xmlhttp.responseText;
   return xmlDoc
   }
   }
   var data = loadDoc('http://localhost/test.php',false)
   console.log(data)
   </script>

2. php：

   <?php
   header('access-control-allow-origin:*');
   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');
   $json = file_get_contents('php://input');
   echo $json;

3. 结果：