在项目中经常有点击复制一段内容或者链接的功能，分享下实现方法：
利用input,textarea特有的select()方法，该元素不可设置display:none和 visibility: hidden;否则无效，可以设置opacity: 0;或者者利用定位到屏幕之外不可见的地方
<!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0'/> <title></title> <style> body { padding: 20px; text-align: center; } .copytxt { opacity: 0; /*不可以用display:none和 visibility: hidden;*/ } </style></head><body><a href="javascript:;" onclick="copyUrl()">点我复制</a><input type="text" class="copytxt"/><script> function copyUrl() { document.getElementsByClassName("copytxt")[0].value = "https://www.baidu.com"; var url = document.getElementsByClassName("copytxt")[0]; url.select(); // 选择需要复制内容的对象 document.execCommand("Copy"); // 执行浏览器复制命令 alert("复制成功"); }</script></body></html><!DOCTYPE html><html><head lang="en"> <meta charset="UTF-8"> <meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0' /> <title></title> <style> body{ padding: 20px; text-align: center; } .copytxt{ opacity: 0;/*不可以用display:none和 visibility: hidden;*/ } </style></head><body><a href="javascript:;" onclick="copyUrl()">点我复制</a><span class="copytxt"></span><script> function copyUrl(){ document.getElementsByClassName("copytxt")[0].innerText = "https://www.baidu.com"; const range = document.createRange(); range.selectNode(document.querySelector(".copytxt")); const selection = window.getSelection(); if(selection.rangeCount > 0) selection.removeAllRanges(); selection.addRange(range); document.execCommand('Copy'); alert("复制成功"); }</script></body></html>原文作者技术博客：https://www.jianshu.com/u/ac4daaeecdfe