jQuery $.getJSON 跨域

代码

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">

   $(function(){
        $.getJSON("http://localhost:60628/website/Default.aspx?jsoncallback=?",
        function(json){
           alert(json.n7);
        });
    });
</script>

</head>

<body>

</body>
</html>

主要注意一下这个参数：

jsoncallback=?

参数名可以任意，服务端要接收"jsoncallback"这个参数,jquery 会动态给这个参数不同的值。

Default.aspx

代码

using System;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string jsoncallback =Request.QueryString["jsoncallback"];
        Response.Write(jsoncallback+"({n7:\"9\"})");
    }
}