Use the .closest method to transfer recursive parent class checking i…

…nto the browser engine for an expected performance improvement (rrweb-io#840)

https://developer.mozilla.org/en-US/docs/Web/API/Element/closest available on all modern browsers

packages/rrweb/src/utils.ts

@@ -230,7 +230,11 @@ export function isBlocked(node: Node | null, blockClass: blockClass): boolean {
  if (node.nodeType === node.ELEMENT_NODE) {
  let needBlock = false;
  if (typeof blockClass === 'string') {
- needBlock = (node as HTMLElement).classList.contains(blockClass);
+ if ((node as HTMLElement).closest !== undefined) {
+ return (node as HTMLElement).closest('.' + blockClass) !== null;
+ } else {
+ needBlock = (node as HTMLElement).classList.contains(blockClass);
+ }
  } else {
  (node as HTMLElement).classList.forEach((className) => {
  if (blockClass.test(className)) {