一个一般处理程序服务端
返回的数据是json
public void ProcessRequest(HttpContext context) ???????{ ???????????citys c = new citys(); ???????????c.age = "12"; ???????????c.city = "bj"; ???????????c.hosst = "www.baidu.com"; ???????????c.name = "张三"; ???????????c.weather = "天气";
???????????string cc = JsonConvert.SerializeObject(c); ???????????context.Response.ContentType = "text/plain"; ???????????????????context.Response.Write( cc ); ???????}
这个一般处理程序返回jsonp
public void ProcessRequest(HttpContext context) ???????{ ???????????citys c = new citys(); ???????????c.age = "12"; ???????????c.city = "bj"; ???????????c.hosst = "www.baidu.com"; ???????????c.name = "张三"; ???????????c.weather = "天气"; ???????????string cc = JsonConvert.SerializeObject(c); ???????????context.Response.ContentType = "text/plain"; ???????????string callbackFunName = context.Request["callback"]; ???????????context.Response.Write(callbackFunName + "([" + cc + "])"); ???????}可以看出jsonp是包裹着json这样理解
json:cc
jsonp:callbackFunName(cc)
下面是客户端的请求
$("#aaa").click(function () { ???????????????$.ajax({ ???????????????????type: "get", ???????????????????async: false, ???????????????????url: "http://www.server.com/handler1.ashx", ???????????????????dataType: "jsonp", ???????????????????jsonp: "callback",//传递给请求处理程序或页面的，用以获得jsonp回调函数名的参数名(默认为:callback) ???????????????????jsonpCallback: "success_jsonpCallback",//自定义的jsonp回调函数名称，默认为jQuery自动生成的随机函数名 ???????????????????success: function (data) { ???????????????????????alert(data); ???????????????????????alert(data[0].name); ???????????????????}, ???????????????????error: function () { ???????????????????????alert(‘fail‘); ???????????????????} ???????????????}); ???????????});
ajax 跨域
原文地址：https://www.cnblogs.com/dcrBook/p/10037075.html