jquery ajax错误{"readyState":0 ,"responseText" :"" ,"status":0 ,"statusText" :"error"}

Question

我正在尝试执行 ajax 请求

$.ajax({
  type: "post",
  url: "download.php",
  error: function(data, status, err){
           alert(JSON.stringify(data));
         },
  data: "fileid="+fileid
});

此请求提醒“{"readyState":0,"responseText":"","status":0,"statusText":"error"}"

我在谷歌上搜索过，我得到的只是跨站点ajax调用(这显然不是)

我尝试输入完整的网址，效果相同。

我唯一能想到的是标题，我不知道它会出现什么问题。这是来自 firebug 的请求 header

Host                www.mydomain.com
User-Agent          Mozilla/5.0 (Windows NT 6.1; rv:5.0) Gecko/20100101 Firefox/5.0
Accept              */*
Accept-Language     en-us,en;q=0.5
Accept-Encoding     gzip, deflate
Accept-Charset      ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection          keep-alive
Content-Type        application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With    XMLHttpRequest
Referer             http://www.mydomain.com/
Content-Length      8
Cookie              PHPSESSID=27b7d3890b82345a4fc9604808acd928

我在不同的页面上添加了另一个请求，它工作得很好，但是这个请求一直失败，另一个请求的 header 是:

Host                www.mydomain.com
User-Agent          Mozilla/5.0 (Windows NT 6.1; rv:5.0) Gecko/20100101 Firefox/5.0
Accept              text/plain, */*; q=0.01
Accept-Language     en-us,en;q=0.5
Accept-Encoding     gzip, deflate
Accept-Charset      ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection          keep-alive
Content-Type        application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With    XMLHttpRequest
Referer             http://www.mydomain.com/differentpage.php
Content-Length      33
Cookie              PHPSESSID=27b7d3890b82345a4fc9604808acd928

Answer 1

我遇到了同样的问题:如何在用户每次单击链接时进行注册。

问题实际上是，如果你不停止弹出窗口，ajax 请求就不会完成，并且你会得到readyState: 0!

我已经完成了上述内容的另一个版本，可能更具可读性(即使更冗长)

/*  --------------------------------------------------------------------------
 *  Before that add 'downloads' class to every anchor tag (link) in your page
 *  This script does the rest
 *  
 *  remember to change 'your_php_file' with the one you use
 *  -------------------------------------------------------------------------- */

$(document).ready( function()
{

    // Check if there is any link with class 'downloads'
    if ( typeof $('.downloads') != 'undefined' )
    {
        var links = $('.downloads');

        // Run this for every download link
        for ( var i = 0; i < links.length; i++ )
        {   
            // Set click behaviour
            links[i].onclick = function(e)
            {
                // Get download name
                var attr = this.attributes,
                    href = attr.href.textContent,
                    elem = href.split('/'),
                    elem = elem[elem.length - 1];

                // Send the download file name and only after completing the request let the user download the file
                $.ajax(
                {
                    type : "POST",
                    dataType : "text",
                    // 'your_php_file' must be an ABSOLUT or RELATIVE path!
                    url: your_php_file,
                    // 'elem' is a variable containing the download name
                    // you can call it in your php file through $_POST['download_name']
                    data: { download_name: elem },
                    // here we go magic:
                    // after the request is done run the popup for the download
                    complete: function()
                    {
                        window.location.href = href;
                    }
                });

                // Stop default behaviour until ajax request has been done
                e.preventDefault();
            };
        }
    }
});