动态生成页面元素的代码_基础知识

第一个： 

<title>Untitled Document</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <script language="JavaScript"> <!-- function addInputFile(spanId,fileId) { var span = document.getElementById(spanId); if ( span !=null ) { if (navigator.userAgent.indexOf("MSIE") == -1){ var fileObj = document.createElement("input"); if ( fileObj != null ) { fileObj.type="file"; fileObj.name = fileId; fileObj.id = fileId; fileObj.size="50"; span.appendChild(fileObj); }//if fileObj fileObj = document.createElement("br"); if ( fileObj != null ) { span.appendChild(fileObj); } } else{ var fileTag = "<input type='file' id ='" + fileId + "' name='" + fileId + "' size=50>"; var fileObj = document.createElement(fileTag); span.appendChild(fileObj); fileTag=" "; fileObj = document.createElement(fileTag); span.appendChild(fileObj); } }//if span } //--> </script> <form name="form1" method="post" action=""> <input type="button" name="Button" value="澧"> </form>