如何创建一个文件夹，如果它不存在？

问题描述：

如果文件夹不存在，我试图创建一个文件夹，但是每次运行它时，代码都会创建一个新文件夹。我不知道我的代码是否正确。

I'm trying to create a folder if it doesn't exist, but the code creates a new folder every time I run it. I don´t know if my code is right.

以下是我的代码：

Here is my code:

var alumnopath = DocsList.getFolderById ('0Bzgw8SlR34pUbFl5a2tzU2F0SUk');
var alumno2 = alumno.toString();
Logger.log(alumno2);
try {
  var folderalumno =  alumnopath.getFolder(alumno2);
  if (folderalumno == undefined){
    var folderalumno =  alumnopath.createFolder(alumno2);
  }
  else {
    var folderalumno =  alumnopath.getFolder(alumno2);
  }
}
catch(e) {
  var folderalumno =  alumnopath.createFolder(alumno2);
}
folderalumno.createFile(pdf.getAs('application/pdf')).rename(  alumno +  " , " + fechafor);

感谢您的帮助!!

Thanks for your help!!

答

截至2016年8月的Google Apps脚本代码

As of Google Apps Script code in 2016 Aug

var par_fdr = DriveApp.getFolderById(123456789A); // replace the ID
var fdr_name = "child_fdr";

try {
  var newFdr = par_fdr.getFoldersByName(fdr_name).next();
}
catch(e) {
  var newFdr = par_fdr.createFolder(fdr_name);
}

如何创建一个文件夹，如果它不存在？

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