深拷貝的幾種方法

deep_clone.js

// ref: https://mobile.twitter.com/DasSurma/status/955484341358022657
//      https://dassur.ma/things/deep-copy/
// performance: https://deep-copy.glitch.me/

// JSON
function structuredCloneJSON(obj) {
  return JSON.parse(JSON.stringify(obj));
}

// History API
function structuredCloneHistory(obj) {
  const oldState = history.state;
  history.replaceState(obj, window.title);
  const copy = history.state;
  history.replaceState(oldState, window.title);
  return copy;
}

// MessageChannel
function structuredCloneMessage(obj) {
  return new Promise(resolve => {
    const {port1, port2} = new MessageChannel();
    port2.onMessage = ev => resolve(ev.data);
    port1.postMessage(obj);
  }); 
}

// Notification API
function structuredCloneNotification(obj) {
  return new Notification('', {data: obj, silent: true}).data;
}