fix lint and comment

Author: wxiaoguang

web_src/js/markup/codecopy.ts

@@ -8,7 +8,7 @@ export function makeCodeCopyButton(): HTMLButtonElement {
 }
 
 export function initMarkupCodeCopy(elMarkup: HTMLElement): void {
-  const el = elMarkup.querySelector('.code-block code') // .markup .code-block code
+  const el = elMarkup.querySelector('.code-block code'); // .markup .code-block code
   if (!el || !el.textContent) return;
 
   const btn = makeCodeCopyButton();

web_src/js/modules/observer.ts

@@ -20,6 +20,9 @@ export function registerGlobalEventFunc<T extends HTMLElement, E extends Event>(
 
 // It handles the global init functions by a selector, for example:
 // > registerGlobalSelectorObserver('.ui.dropdown:not(.custom)', (el) => { initDropdown(el, ...) });
+// ATTENTION: For most cases, it's recommended to use registerGlobalInitFunc instead,
+// Because this selector-based approach is less efficient and less maintainable.
+// But if there are already a lot of elements on many pages, this selector-based approach is more convenient for exiting code.
 export function registerGlobalSelectorFunc(selector: string, handler: (el: HTMLElement) => void) {
   selectorHandlers.push({selector, handler});
   // Then initAddedElementObserver will call this handler for all existing elements after all handlers are added.