<form> 
   <p> 
    <label for="message" style="color:red;font-size:24px;">给iframe子窗口发一个信息：</label> 
    <input type="text" name="message" value="send" id="message" /> 
    <input type="submit" value="submit" id="submit"/> 
   </p> 
</form> 
<h4>目标iframe传来的信息：</h4> 
<p id="test">暂无信息</p> 
 <iframe id="iframe" 
  src="http://longen.example.com/webSocket/def.html" style="display:none"></iframe>

var win = document.getElementById("iframe").contentWindow;
document.getElementById("submit").onclick = function(e){
  e.preventDefault();
  win.postMessage(document.getElementById("message").value,"http://longen.example.com"); 
} 
window.addEventListener("message",function(e){
   e.preventDefault();
   document.getElementById("test").innerHTML = "从" + e.origin + "那里传过来的消息:\n" + e.data;
},false);

<form> 
   <p> 
    <label for="message">给父窗口abc.html发个信息：</label> 
    <input type="text" name="message" value="send" id="message" /> 
    <input type="submit" /> 
   </p> 
 </form> 
 <p id="test2">暂无信息。</p>

var parentwin = window.parent; 
window.addEventListener("message",function(e){
    document.getElementById("test2").innerHTML = "从父窗口传来的域" +e.origin + "，和内容数据：" + e.data; 
    parentwin.postMessage('HI!你给我发了"<span>'+e.data+'"</span>。',"http://abc.example.com");
},false);

var win = document.getElementById("iframe").contentWindow;
document.getElementById("submit").onclick = function(e){
   e.preventDefault();
   win.postMessage(document.getElementById("message").value,"http://longen.example.com/"); 
} 
window.addEventListener("message",function(e){
  e.preventDefault();
  alert(typeof e.data)
  var json = JSON.parse(e.data);
   console.log(json);
  alert(json.url)
},false);

//获取跨域数据 
window.onmessage = function(e){ 
   $.ajax({
     url: 'http://longen.example.com/webSocket/test.php',
     type:'POST',
     dataType:'text',
     //data: {msg:e.data},
     success: function(res) {
        var parentwin = window.parent; 
        parentwin.postMessage(res,"http://abc.example.com");//跨域发送数据 
     }
   });
 };

<?php 
  $data=array( 
   url =>1,
   name =>'2',
   'xx-xx'=>"xx"
 );
 echo json_encode($data);
?>