这个例子应该让你开始。您需要在每个 InDesign 会话中运行一次脚本。例如，您可以将其添加为启动脚本。每次用户将文档保存为 idml 文件时，它都会保存。

#targetengine "session"
// we need a targetegine to make this work
var doc = app.activeDocument; // get the current doc

// now to the event listener
app.addEventListener('afterSave', function(theEvent) {
  $.writeln('saving'); // just to see whats going on
  if (!doc.saved) {
    // catch those possible mistakes
    alert('doc was never saved');
    exit();
  }
  var aName = doc.name; // get the name
  var newName = aName.replace("indd", "idml"); // replace the indd to idml
  // crate a new File Object next to the indd
  var theFile = File(File(doc.filePath).fsName + "/" + newName);
  // export
  doc.exportFile(ExportFormat.INDESIGN_MARKUP, theFile, false);
});

如果您想将此作为菜单命令，您可以查看关于indiscripts的这篇博文。

谢谢@fabiantheblind，效果很好。我已经对其进行了调整以使其作为启动脚本工作（它等待打开文档）。

// Set a targetengine to make this work
#targetengine "session"

function saveIDML() {
    // Exit if no documents are open.
    if(app.layoutWindows.length == 0) {
        return;
    } else {
        // Get the current document
        var doc = app.activeDocument;
        $.writeln('Saving IDML of ' + doc + ' ...');
        // Catch errors
        if (!doc.saved) {
          alert('Sorry, there was a problem and the document was not saved.');
          exit();
        }
        // Create a new .idml file name from the .indd file name
        var inddName = doc.name;
        var idmlName = inddName.replace("indd", "idml");
        // Create the new .idml file next to the .indd file
        var theFile = File(File(doc.filePath).fsName + "/" + idmlName);
        doc.exportFile(ExportFormat.INDESIGN_MARKUP, theFile, false);
    }
}
// Listen for the save event
app.addEventListener('afterSave', saveIDML, false);

我发现@Arthur 的脚本非常有用。但是，我只想使用它afterSave，而且afterSaveAs（这很容易扩展：只需附加另一个事件侦听afterSaveACopy器命令）和（我自己无法完成；我在community.adobe.com寻求帮助）。

现在我有一个适用于所有三个用例的工作脚本，见下文。

// src: https://community.adobe.com/t5/indesign/get-the-name-of-the-document-created-by-save-a-copy/m-p/10997427#M179868 (based on https://graphicdesign.stackexchange.com/a/71770, which is based on https://graphicdesign.stackexchange.com/a/71736)
// author: Fabian Morón Zirfas (fabianmoronzirfas@graphicdesign.stackexchange.com), modified by Arthur (Arthur@graphicdesign.stackexchange.com), modified by Sunil_Yadav1 (Sunil_Yadav1@community.adobe.com)
// date: 24 March 2020

// Set a targetengine to make this work
#targetengine "session"

function saveIdml() {
    if(app.layoutWindows.length == 0) {
        return;
    } else if (! app.activeDocument.saved) {
        alert('Sorry, there was a problem and the document was not saved.');
        return;
        }

    var idmlPath = app.activeDocument.filePath.fsName.replace(/\\/g,'/') + '/' + app.activeDocument.name.replace(/\.indd|\.indt/g, '.idml');
    app.activeDocument.exportFile(ExportFormat.INDESIGN_MARKUP, idmlPath, false);
    }

function saveACopyIdml(e) {
    var idmlPath = File(e.properties.fullName).fsName.toString().replace(/\\/g,'/').replace(/\.indd|\.indt/g, '.idml');
    app.activeDocument.exportFile(ExportFormat.INDESIGN_MARKUP, idmlPath, false);
    }

// Listen for the save event
app.addEventListener('afterSave', saveIdml, false);
app.addEventListener('afterSaveAs', saveIdml, false);
app.addEventListener('afterSaveACopy', saveACopyIdml, false);