<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>替换子节点replaceChild()</title> <!-- node.replaceChild(a,b)将父节点node的子节点b替换为子节点a --> </head> <body> <div>我要被替换了</div> <script> var div=document.getElementsByTagName("div")[0];//获取子节点 var newdiv=document.createElement("div");//创建新的子节点 newdiv.innerHTML="我是新的，我替换了老的div";//为新的子节点添加内容 document.body.replaceChild(newdiv,div);//替换 </script> </body> </html>