如何使用Object.assign仅克隆属性？

Question

I am trying to send a message whose content is derived from a Javascript proxy, and the postMessage() method fails except when I manually copy the the properties of my proxy on a new object:

Failed to execute 'postMessage' on 'Window': [object Object] could not be cloned.]

However, if I manually assign all the fields through boilerplate code like so

 var b = {};
 b.myField = a.myField;

the postMessage works fine. What I was expecting is that the following would have worked fine too:

var b = Object.assign({},a);

but in this case it fails with the same message. Why is Object.assign cloning properties and how can I debug the cloning error?

Answer 1

I had issues with Object.assign in Lightning too. I did good, using:

var b = JSON.parse(JSON.stringify(a));

My issue back then was, that Object.assign({},a) made a clone by reference and not by value. (I know this only answers the second part of your question, but maybe you can use it as a workaround so far)

I just read you are using a Window function. Be aware, that the window object is a wrapper object in lightning due to the locker service