<!DOCTYPE html><html lang="zh-CN"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>复制克隆节点</title> </head> <body> <ul> <li>li1</li> <li>li2</li> <li>li3</li> </ul> <script> const ul = document.querySelector('ul') /* * 复制节点 cloneNode() * 参数为空或者 false,则是浅拷贝 * 参数为 true,则是深拷贝 */ let clone1 = ul.children[0].cloneNode() let clone2 = ul.children[0].cloneNode(true) // 添加节点 ul.appendChild(clone1) ul.appendChild(clone2) </script> </body></html>