javascript - JavaScript 中的对象声明

Question

我有以下代码。现在，当调用构造函数时，就会创建对象。现在，当更新字段时，它们会像这样更新。请注意，我无法修改 Comment()，因为它是由 mongoose 创建的。

  var newComment = new Comment();
  newComment.content = req.body.content;
  newComment.user.id = req.body.id;
  newComment.user.name = req.body.name;
  newComment.user.profilePicture = req.user.profilePicture;
  newComment.votes.up = [];
  newComment.votes.down = [];
  newComment.comments = [];
  newComment.timestamp = Date.now();

有没有办法像这样更新对象:

newComment.SOMEFUNCTION({
  content = req.body.content;
  user.id = req.body.id;
  user.name = req.body.name;
  user.profilePicture = req.user.profilePicture;
  votes.up = [];
  votes.down = [];
  comments = [];
  timestamp = Date.now();
});

Answer 1

Object.assign

The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object.

Object.assign( newComment, {
    content : req.body.content,
    user : {
      id : req.body.id,
      name : req.body.name,
      profilePicture : req.user.profilePicture
    },
  votes.up : [],
  votes.down : [],
  comments : [],
  timestamp : Date.now()
});

http://jsfiddle.net/r8pavnuv/