How can I incorporate the importRange feature into a Javascript function for Google Sheets?

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Here is an example of a Google Apps Script function that uses the importRange function to retrieve data from another sheet:

function myFunction() {
  var sourceSheetUrl = 'https://docs.google.com/spreadsheets/d/1234567890abcdefghijklmnopqrstuvwxyz/edit#gid=987654321';
  var sourceSheetRange = 'Sheet1!A1:C10';
  var targetSheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Sheet2');
  var importedRange = SpreadsheetApp.openByUrl(sourceSheetUrl).getRange(sourceSheetRange).getValues();
  targetSheet.getRange(1, 1, importedRange.length, importedRange[0].length).setValues(importedRange);
}

In this example, the importRange function is used to get the values from a range in a sheet specified by sourceSheetUrl and sourceSheetRange. The imported range is then copied to Sheet2 in the active spreadsheet using the setValues method.

Note that this function uses Google Apps Script, which is a scripting language based on Javascript that is used to automate tasks in Google Sheets and other Google apps. To create and run this function, you'll need to open the script editor in Google Sheets (Tools > Script editor), paste in the code, save it, and then run it from the script editor (Run > myFunction).