实例解析jquery ajax jsonp跨域调用

更新时间：2020-03-16 09:30:37
编辑：暴冰双

客户端代码

	
	<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApp.WebForm1" %>

	<!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" >

	<head runat="server">

	<script src="jquery-1.7.1.min.js" type="text/javascript"></script>

	<script type="text/javascript">

	    function aa() {

	        $.ajax({

	            url: "http://localhost:12079/WebForm2.aspx",

	            data: "p1=1&p2=2&callback=?",

	            type: "post",

	            processData: false,

	            timeout: 15000,

	            dataType: "jsonp",  // not "json" we'll parse

	            jsonp: "jsonpcallback",

	            success: function(result) {

	            alert(result.value1);

	            }

	        });

	    }

	</script>

	    <title></title>

	</head>

	<body>

	    <form id="form1" runat="server">

	    <div>

	    </div>

	    </form>

	    <p>

	        <input id="Button1" type="button" value="button" onclick="aa()" /></p>

	</body>

	</html>

服务器端代码

	
	 public partial class WebForm2 : System.Web.UI.Page

	    {

	        protected void Page_Load(object sender, EventArgs e)

	        {

	         string callback = Request["callback"];

	            string v1="1";

	            string v2="2";

	            string response = "{\"value1\":\"" + v1 + "\",\"value2\":\"" + v2 + "\"}";

	            string call = callback + "(" + response + ")";

	            Response.Write(call);

	            Response.End();

	        }

	    }

客户端页面和服务器端页面在两个项目中，以便进行跨域调用测试。

跨域实例代码（需要加载jquery，页面为utf-8编码）：

	
	 <!--拉勾招聘数据-->

	  <script type="text/javascript">

	   function success_jsonpCallback(data){

	    var html = '';

	    var pos = '';

	    html += '<ul>';

	    jQuery.each(data, function(k, v) {

	                 if(k<10){

	                  pos = '【' + v.city+ '】' + v.positionName + '('+ v.salary +') - '+v.companyName;

	      if(pos.length > 20){

	       pos = pos.substring(0,19)+'...';

	                     }

	                     html += '<li><a href="'+v.posiitonDetailUrl+'" target="_blank" title="【' + v.city+ '】' + v.positionName + '('+ v.salary +') - '+v.companyName+'">'+pos+'</a></li>';

	                 }

	    });

	    html += '</ul><div class="more-link"><a href="http://www.lagou.com/jobs/list_%E5%89%8D%E7%AB%AF%E5%BC%80%E5%8F%91" target="_blank">更多</a></div>';

	    jQuery('#lagouData').html(html);

	   }

	   function getLagouData() {

	    jQuery.ajax({

	     async:false,

	     url: "http://www.lagou.com/join/listW3cplus?kd=%E5%89%8D%E7%AB%AF%E5%BC%80%E5%8F%91",

	     type: "GET",

	     dataType: "jsonp",

	     jsonpCallback: 'success_jsonpCallback',

	     contentType: "application/jsonp; charset=utf-8",

	     success: function(data) {

	      success_jsonpCallback(data);

	     }

	    });

	   }

	   getLagouData();

	        </script>

	      <div id="lagouData"></div>

jsonp代码：

	

	success_jsonpCallback([{"city":"广州","companyName":"POCO.CN","createTime":"15:02发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/16868.html","positionAdvantage":"身处凝聚力团队，老城区上班交通便利，双休","positionName":"商业前端开发工程师","salary":"4k-7k"},{"city":"北京","companyName":"美通云动（北京）科技有限公司","createTime":"14:47发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/16866.html","positionAdvantage":"Html5技术最棒的团队","positionName":"Web前端开发","salary":"4k-8k"},{"city":"杭州","companyName":"口袋购物","createTime":"14:42发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/13024.html","positionAdvantage":"广阔的发展平台、自我价值体现的地方","positionName":"web前端开发工程师","salary":"8k-12k"},{"city":"北京","companyName":"布丁移动","createTime":"14:02发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/1498.html","positionAdvantage":"三餐、周围美女如云","positionName":"Android开发工程师","salary":"10k-20k"},{"city":"北京","companyName":"布丁移动","createTime":"14:02发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/2539.html","positionAdvantage":"三餐，小桥流水人家，美女","positionName":"ios开发工程师","salary":"10k-20k"},{"city":"上海","companyName":"天天动听","createTime":"00:55发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/11494.html","positionAdvantage":"创业氛围 讲求小而美","positionName":"Android开发工程师","salary":"8k-16k"},{"city":"北京","companyName":"LBE安全大师","createTime":"11:39发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/5983.html","positionAdvantage":"五险一金 绩效奖金","positionName":"Android开发工程师","salary":"8k以上"},{"city":"北京","companyName":"点心移动","createTime":"11:24发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/16736.html","positionAdvantage":"技术导向的团队氛围，全方位的福利待遇","positionName":"Android","salary":"15k-25k"},{"city":"广州","companyName":"荔枝FM","createTime":"10:44发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/16634.html","positionAdvantage":"连坚持跑步、保持体重都有奖励哦！","positionName":"WP手机开发工程师","salary":"16k-25k"},{"city":"北京","companyName":"网银-京东子公司","createTime":"10:08发布","posiitonDetailUrl":"http://www.lagou.com:80/jobs/14162.html","positionAdvantage":"负责京东商城-互联网金融产品 JS开发","positionName":"Javascript 前端开发工程师","salary":"10k-20k"}])