JSON跨域請求

原理:首先客戶機會註冊一個callback,在發送跨域請求以前,會在url後附帶註冊的callback參數(如:callback1982342322),隨後服務器拿到了callback參數,獲取數據後再拼接json數據(如:callback1982342322({status:"ok",fantasy [{ key:value }] }) ),此處應該注意服務器拿到的callback要和客戶機上的callback一致,不然跨域不成功,用chrom瀏覽器可發現 callbackxxx is not defined javascript

1. 客戶端跨域請求json數據方式html

  - $.ajax( type , async , url , dataType , jsonp ,success : function(json){expression...} , error : function(){expression...})java

  這裏說明一點,就是jquery是不支持post方式的跨域請求jquery

  - $.getJSON( url , param , function(json){ expression ... })web

2. 服務器端設置ajax

  參數: callback / param...chrome

  響應: callback({express

      status:"ok",json

      fantasy[{跨域

        key1:value1,

        key2:value2

        }]

      });

3. 錯誤

  收集了測試和實戰過程當中出現的一些錯誤

    1.Origin null is not allowed by Access-Control-Allow-Origin 不支持本地Ajax請求

   2.jquery12334223232 is not defined  沒有註冊callback參數,利用谷歌瀏覽器的開發者工具查看跨域請求裏是否含有callback參數和值,而後檢查服務器是否接收                       callback參數並拼接成json格式的數據響應給客戶機

   3.XMLHttpRequest cannot load http://i.nubb.com/fcms/conn/shareToFantasy.htm?fid=11&callback=jsoncallback102131211. Origin http://fantasy.nubb.com is not allowed by Access-Control-Allow-Origin.

  解決方法:選定google瀏覽器快捷方式右鍵 -> 屬性 -> 目標(T) -> 加上 --disable-web-security (如:"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --disable-web-security)

4. 實例:

  

<script type="text/javascript">
                        jQuery(document).ready(function(){ 
                            $.ajax({
                                 type: "get",
                                 async: false,
                                 url: "http://i.nubb.com/fcms/conn/shareToFantasy.htm?fid=<%=team.getFans_id()%>&format=jsonp",
                                 dataType: "jsonp",
                                 jsonp: "callback",//傳遞給請求處理程序或頁面的,用以得到jsonp回調函數名的參數名(通常默認爲:callback)
                                 success: function(json){
                                     //dom生成數據
                                     for(var num in json.fantasy){
                                 var html = "<div class=\"tao\"><div class=\"tao1\"><span class=\"t\">"
                                        +"<p><span>$qc-read</span><a href=\"#\"><img src=\"/images/sd_career/liu.gif\" /> </a></p>"
                                        +"</span><div class=\"wenzi\">"
                                        +"<h3>$qc-title</h3>"
                                        +"<div class=\"d\">"
                                        +"<p><a href=\"http://i.nubb.com/fans/Topicdetail.htm?fid=$qc-fid&aid=$qc-aid\" target=\"_blank\">$qc-desc</a>"
                                        +"<dl>"
                                            +"<dt><a href=\"javascript:;\" target=\"_blank\"><img src=\"http://i.nubb.com$qc-ulogo\" /></a></dt>"
                                            +"<dd><a href=\"http://i.nubb.com/home/$qc-uid.htm\" target=\"_blank\">$qc-uname</a> <span id=\"qc-time\">發佈於 $qc-time</span></dd>"
                                        +"</dl>"
                                        +"</p></div></div></div></div>";
                                         console.log(json.fantasy[num]);
                                         html = html.replace("$qc-aid", json.fantasy[num].aid);
                                         html = html.replace("$qc-fid", <%=team.getFans_id()%>);
                                         html =html.replace("$qc-read", json.fantasy[num].read);
                                         html =html.replace("$qc-title", json.fantasy[num].title);
                                         html =html.replace("$qc-desc", json.fantasy[num].desc);
                                         html =html.replace("$qc-uid", json.fantasy[num].uid);
                                         html =html.replace("$qc-uname", json.fantasy[num].uname);
                                         html =html.replace("$qc-ulogo", json.fantasy[num].ulogo);
                                         html =html.replace("$qc-time", json.fantasy[num].time.substring(0,10));
                                         $(".taolun").append(html);
                                     }
                                 },
                                 error: function(){
                                     console.log('非法請求');
                                 }
                             });
                         });
                    </script>
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