【基礎】Html跨域跳轉問題整理

今天遇到一個問題，是有關 跨域跳轉問題，涉及到知識比較基礎。

具體問題是：

$(function(){
    $('#send').click(function(){
         $.ajax({
             type: "GET",
             url: "http://localhost:PageB/", 
             data: {username:$("#username").val(), content:$("#content").val()}, dataType: "json", success: function(data){ $('#resText').empty(); //清空resText裡面的所有內容 var html = ''; $.each(data, function(commentIndex, comment){ html += '<div class="comment"><h6>' + comment['username'] + ':</h6><p class="para"' + comment['content'] + '</p></div>'; }); $('#resText').html(html); } }); }); });

2.通過Request模擬Post提交

類似以下這種後臺模擬Request,答案是否定的

public  string HttpPost(string Url, string postDataStr, HttpForType hft) {

            SetAllowUnsafeHeaderParsing20(true);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
 
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.CookieContainer = cookie; //cookie信息由CookieContainer自行維護

            var sss11 = GetAllCookies(cookie);
             
            request.UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)";
            Stream myRequestStream = request.GetRequestStream();
            StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
            myStreamWriter.Write(postDataStr);
            myStreamWriter.Close();

            HttpWebResponse response = null;
            try {
                SetCertificatePolicy();
                response = (HttpWebResponse)request.GetResponse();
            } catch (System.Exception ex) {
                return ex.Message.ToString();
            }
            //獲取重定向地址
            //string url1 = response.Headers["Location"];
            if (response != null) {
                var sss22 = GetAllCookies(cookie);

                Stream myResponseStream = response.GetResponseStream();
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
                string retString = myStreamReader.ReadToEnd();
                myStreamReader.Close();
                myResponseStream.Close();
            
                string retString = response.GetResponseHeader("Location");
 
                return retString;
            } else {
                return "error"; //post請求返回為空
            }
        }

3.拼湊form表單形式Post提交  

類似以下這種ajax,答案是肯定的，可以直接從 A頁面 跳轉到C頁面(調試發現：B頁面跳轉C頁面是在B頁面後臺處理的，處理完返回302跳轉碼和新地址到瀏覽器，302的新地址,header的location屬性值就是C頁面地址)

或者在A頁面插入類似以下表單形式，答案也是可以跳轉到C頁面:

 <form action="http://localhost:PageB/" method="post">
        <input id="name" name="name" value="123"/>

以上是討論的Post跨域跳轉問題。