JSON

JSON:

• RegExp .
• Blob, File, FileList .
• ImageData . The dimensions of the clone's CanvasPixelArray will match the original and have a duplicate of the same pixel data.
• Structured clones can correctly duplicate objects containing cyclic graphs of references.

,

• Error and Function objects cannot be duplicated by the structured clone algorithm; attempting to do so will throw a DATA_CLONE_ERR exception.
• Attempting to clone DOM nodes will likewise throw a DATA_CLONE_ERR exception.
• Certain parameters of objects are not preserved:
  • The lastIndex field of RegExp objects is not preserved.
  • Property descriptors, setters, and getters (as well as similar metadata-like features) are not duplicated. For example, if an object is marked read-only using a property descriptor, it will be read-write in the duplicate, since that's the default condition.
  • The prototype chain does not get walked and duplicated.

:

(. , ), . .

function clone(objectToBeCloned) {
  // Basis.
  if (!(objectToBeCloned instanceof Object)) {
    return objectToBeCloned;
  }

  var objectClone;

  // Filter out special objects.
  var Constructor = objectToBeCloned.constructor;
  switch (Constructor) {
    // Implement other special objects here.
    case RegExp:
      objectClone = new Constructor(objectToBeCloned);
      break;
    case Date:
      objectClone = new Constructor(objectToBeCloned.getTime());
      break;
    default:
      objectClone = new Constructor();
  }

  // Clone each property.
  for (var prop in objectToBeCloned) {
    objectClone[prop] = clone(objectToBeCloned[prop]);
  }

  return objectClone;
}

• HTML5 Specification: Safe passing of structured data
• window.history
• window.postMessage()
• Web Workers
• Components.utils.cloneInto