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<script language="javascript">
        function onclickbtn()
        {
            var id = "getfreescript";
            var url = "http://localhost:5311/test/source.aspx";//ÀïÃæÊä³öºÜ¼òµ¥µÄjson¸ñʽjs
            getOtherDomainData(id,url);
        }
       
        function getOtherDomainData(id, url){
        var dataScript = document.getElementById(id);
    var head = document.getElementsByTagName("head")[0];
    if (dataScript != null) {
    head.removeChild(dataScript);
    dataScript = null;
    }
    dataScript = document.createElement("script");
    var charset = "gb2312";
    dataScript.setAttribute("id",id);
    dataScript.setAttribute("charset",charset);
    dataScript.setAttribute("src",url);
    dataScript.setAttribute("type","text/javascript");
    head.appendChild(dataScript);
};

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