javascript - Why can't I delete a mongoose model's object properties? -

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When a user is registered with my API, they return a user object. Before returning to the object, I remove the head password and salt properties. I have to use 

  user.salt = undefined; User.pass = undefined;

Because when I try 

  delete user.salt; Delete User.pass;  Delete      To use "itemprop =" text "> 
 you have to call the column in a simple JavaScript object so that you can easily You can manipulate:  
  user = user.toObject (); Delete User.salt; Delete User.pass;

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