最近易迅有签到活动，看了下代码，发现有相关跨域的部分，稍微整理了下，备注下
from 和 iframe 相互结合进行的，也设置了相关 document.domain
个人感觉没必要，还是首推jsonp方式，只是没办法支持post提交
js
G.util.post = function(c, g, b) { G.util.post.pIndex = (G.util.post.pIndex || 0) + 1; var d = $('<iframe name="pIframe_' + G.util.post.pIndex + '" src="about:blank" style="display:none" width="0" height="0" scrolling="no" allowtransparency="true" frameborder="0"></iframe>').appendTo($(document.body)); var a = []; $.each(g, function(i, h) { a.push('<input type="hidden" name="' + i + '" value="" />') }); if (!/(\?|&(amp;)?)fmt=[^0 &]+/.test(c)) { c += (c.indexOf("?") > 0 ? "&" : "?") + "fmt=1" } var f = $('<form action="' + c + '" method="post" target="pIframe_' + G.util.post.pIndex + '">' + a.join("") + "</form>").appendTo($(document.body)); $.each(g, function(i, h) { f.children("[name=" + i + "]").val(h) }); d[0].callback = function(h) { if (typeof b == "function") { b(h) } $(this).src = "about:blank"; $(this).remove(); f.remove(); d = f = null }; if ($.browser.msie && $.browser.version == 6) { d[0].pIndex = G.util.post.pIndex; d[0].ie6callback = function() { f.target = "pIframe_" + this.pIndex; f.submit() }; d[0].src = location.protocol + "//st.51buy.com/static_v1/htm/ie6post.htm" } else { f.submit() } };
st.51buy.com/static_v1/htm/ie6post.htm
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <meta http-equiv="Content-Language" content="zh-cn" /> <title>POST</title> <script type="text/javascript">document.domain='51buy.com';</script> </head> <body> <script type="text/javascript"> <!-- if('function' == typeof frameElement.ie6callback) frameElement.ie6callback(); //--> </script> </body> </html>
返回的信息
<?xml version="1.0" encoding="gb2312"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <meta http-equiv="Content-Language" content="gb2312" /> <meta name="robots" content="all" /> <meta name="author" content="Tencent-ISRD" /> <meta name="Copyright" content="Tencent" /> <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /> <title>POST - ICSON</title> </head> <body> <script type="text/javascript"> <!-- document.domain="51buy.com"; frameElement.callback({"errno":0,"data":{"signinfo":[{"sign_time":"2013-05-04 08:09:22","award_id":"7|11|"},{"sign_time":"2013-05-11 22:27:00"},{"sign_time":"2013-05-13 23:04:57"},{"sign_time":"2013-05-14 22:23:27"},{"sign_time":"2013-05-15 22:36:46"}],"curtime":1368669984}}); //--> </script> </body> </html>