提示:按下提交按钮后，看看有什么不同？
1.将下面的代码复制到 <body> 或者 <head> 内
<script> /* Submit Once form validation- � Dynamic Drive (www.dynamicdrive.com) For full source code, usage terms, and 100's more DHTML scripts, visit http://dynamicdrive.com */ function submitonce(theform){ //if IE 4+ or NS 6+ if (document.all||document.getElementById){ //screen thru every element in the form, and hunt down "submit" and "reset" for (i=0;i<theform.length;i++){ var tempobj=theform.elements[i] if(tempobj.type.toLowerCase()=="submit"||tempobj.type.toLowerCase()=="reset") //disable em tempobj.disabled=true } } } </script>
2.在提交<form>中加入 onSubmit="submitonce(this)" 如下
<form method="POST" onSubmit="
submitonce(this)
">
