<!DOCTYPE html> <html lang="en"> <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>Document</title> </head> <body> <p>copy the code</p> <p id="result"></p> </body> <script> document.addEventListener('copy', function (event) { // clipboardData 对象是为通过编辑菜单、快捷菜单和快捷键执行的编辑操作所保留的,也就是你复制或者剪切内容 let clipboardData = event.clipboardData || window.clipboardData; if (!clipboardData) { return; } let text = window.getSelection().toString(); let add = " ******** 内容拼接 ********"; if (text) { // 如果文本存在,首先取消文本的默认事件 event.preventDefault(); clipboardData.setData('text/plain', text + add); document.querySelector('#result').innerText = text + add; } }); </script> </html>