认识JSONP

方式一：
 <script type="text/javascript" src="http://localhost:23415/2012Test/testJasonp.ashx?callback=mycallback"></script><!--这里的地址指跨域地址-->
方式二：
 <script type="text/javascript">
        function createScript()
        {
            var myScript = document.createElement("script");
            myScript.setAttribute("type", "text/javascript");
            myScript.setAttribute("src", "http://localhost:23415/2012Test/testJasonp.ashx?callback=mycallback");
            document.body.appendChild(myScript);
        }


        function mycallback(data)
        {
            alert(data.msg);
        }


        window.onload = function () {
            document.getElementById("getOtherDomainData").addEventListener("click", function () {
                createScript();
            });
        }
    </script>
<input type="button" id="getOtherDomainData" value="发起跨域请求" />

//testJasonp.ashx返回的数据为context.Response.Write("mycallback({\"msg\":\"ok\"})");