name写成 "arr[]"的形式就可以了
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>作业管理</title> </head> <body> <form enctype="multipart/form-data" method="POST" > <div id="postform"> 本次作业标题 <input type="text" name="title" /> <br> <div class="postoption"> 添加项目 <input type="text" name="option[]" /> 音频文件 <input type="file" name="radio[]" /> 答案 <input type="text" name="answer[]" /> </div> </div> <input type="submit" value="提交" /> </form> <button id="add">添加输入项</button> <script type="text/javascript"> window.onload = function(){ var add = document.getElementById("add"); add.onclick = function(){ addOption(); } } function addOption(){ var postForm = document.getElementById("postform"); var postoptions = document.getElementsByClassName("postoption"); var op = postoptions[0]; var optionClone = op.cloneNode(true); postForm.appendChild(optionClone); }; </script> </body> </html>
button不能放在form里面，不然就会提交，不知道为什么