first commit

20250916/ppt/js/utils.js

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+/** 简单工具 */
+export function el(selector, root = document) {
+  return root.querySelector(selector);
+}
+export function els(selector, root = document) {
+  return Array.from(root.querySelectorAll(selector));
+}
+
+export function safeAssign(target, src) {
+  return Object.assign({}, target, src);
+}