javascript – 使用AJAX发送JSON

在我用AJAX发送它之前,我有什么特别要对JSON对象做的吗？我的代码看起来像这样：

runAjax(JSON.stringify(data));

}

function runAjax(JSONstring)
{
    ajax = getHTTPObject();
    var params = "?data=" + JSONstring;
    ajax.open("POST", "createtrip.PHP", true);
    ajax.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    ajax.setRequestHeader("Content-length", params.length);
    ajax.setRequestHeader("Connection", "close");
    ajax.onreadystatechange = serverSpeaks;
    ajax.send(params);
}

现在服务器没有收到数据.我在服务器端获取null,但客户端JSONString已设置.有什么我做错了吗？

解决方法:

你是通过POST发送数据,你不需要’？’在params变量开头的字符,我也建议你使用encode JSONString来避免问题.

请注意,您缺少ajax变量的var语句,这是全局声明它(window.ajax),我认为您不需要全局…

function runAjax(JSONstring) {
  var params = "data=" + encodeURIComponent(JSONstring), 
      ajax = getHTTPObject();

  ajax.open("POST", "createtrip.PHP", true);
  ajax.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  ajax.setRequestHeader("Content-length", params.length);
  ajax.setRequestHeader("Connection", "close");
  ajax.onreadystatechange = serverSpeaks;
  ajax.send(params);
}