怎么用一个ajax把一个div里的数据提交给后台的php执行呢，就是保存？

<code>var t = $('#content').text();
$.post('up.php', {text:t}, function(d) {
    /*发送成功后执行*/
});
</code>

<code class="lang-js">// createRequest()是自己写的兼容函数
request = new createRequest();
var data = 'content='+div.innerHTML+'&id='+num;
request.open("POST",url,true);
request.setRequestHeader("Content-Type","text/plain");
request.send(data);
request.onreadystatechange=callback;

// 这个函数特意从以前写过的程序里拿出来，应该是以前从红皮书里抄来的QAQ忘记了
function createRequest() {
  try {
    request = new XMLHttpRequest();
  } catch (tryMS) {
    try {
      request = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (otherMS) {
      try {
        request = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (failed) {
        request = null;
      }
    }
  } 
  return request;
}
</code>

<code>var t = $('#content').text();
//或者 var t=$('#content').html();
$.post('up.php', {text:t}, function(d) {
    /*发送成功后执行*/
});
</code>