{"readyState":0,"responseText":"","status":0,"statusText":"error"}[object Object]

$.ajax({
    url:"http://localhost:8080/php/ts.php",
    type: "post",
    dataType:"text",
    contentType: 'application/json',
    async: true,
    timeout: 50000,
    success:function(json){
         alert(json);
         $("#div").append(json);
    },
    error:function(err){
        var json= JSON.stringify(err);
        $("#div").append("错误"+json+err);
1.         alert("错误"+err)
    }
});

<?php
header("Content-Type: text/html;charset=utf-8");
$szUrl = "ss";
$UserAgent = 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; .NET CLR 3.5.21022; .NET CLR 1.0.3705; .NET CLR 1.1.4322)';
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $szUrl);
curl_setopt($curl, CURLOPT_HEADER, 0);  //0表示不输出Header，1表示输出
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl, CURLOPT_ENCODING, '');
curl_setopt($curl, CURLOPT_USERAGENT, $UserAgent);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
$data = curl_exec($curl); 
echo $data;
//echo curl_errno($curl); //返回0时表示程序执行成功 
exit();

ajax 请求始终返回

{"readyState":0,"responseText":"","status":0,"statusText":"error"}[object Object]

我应该知道你出现object的原因：dataType应是datatype，今天我就因为一个大小写结果都是object