问使用express node.js，调用函数中的函数，并在路由器中导出和要求，并在路由器中渲染时提交给ejs。

EN

exports.generateUrlWithParam = function(idpUrl,subUrl,param){
  var url = generateUrl(idpUrl, subUrl);

  if(url == null) {
      return null;
  }

  var paramStr = generateParam(param);

  return url + "?" + paramStr;
}

exports.generateUrl = function(idpUrl, subUrl) {
    if((idpUrl == null || ""==idpUrl.trim()) && (subUrl == null || ""==subUrl.trim())) {
        return null;
    }

    let url = idpUrl
    if(!idpUrl.endsWith("/")) {
        url += "/";
    }

    url += subUrl;

    url = url.replace(/\/+/g, "/");

    if(url.startsWith("http:/") && !url.startsWith("http://")) {
        url = url.replace(/^http:\//, "http://");
    } else if(url.startsWith("https:/") && !url.startsWith("https://")) {
        url = url.replace(/^https:\//, "https://");
    }

    return url;
}