JS是前台的语言，PHP是后台的语言，初学时会经常出现前后台分不清的情况（我当初就是这样的，现在有时也在犯），我当初的想法是就把前后台当成两个岛，他们是无法跨越的，HTML就像一座桥，当你想要把一座岛上的变量传到另一个岛上，只有借助于这座桥。
我来做个小小的总结吧：
1：HTML中的值如何传到JS,下面假设是文件1.php
<html> <body> <form action="1.php" method="post"> name:<input type="text" name="username" id="username"> rename:<input type="text" name="username1" id="username1"> <input type="button" value="submit" on CliCk="get()"> </form> </body> </html>
JS假如想取文本框中用户输入的name值，这样写
<script language='JavaScript'>function get(){var n=document.getElementById('username').value;alert (n);}</script> 这样的话在有调用JS get()时就会弹出警示框，里面的内容就是name的值。
2:假如说JS中的这个取到的name值要传回rename的文本框中，这样写
<script language='JavaScript'> function get() { var n=document.getElementById('username').value; document.getElementById("username1").value=n; }</script> 这样的话在下面调用get()就会自动显示你上面name输入的值。
3：PHP中取页面的值
这个我想大家都会了吧
<?php$name=$_REQUEST["username"];echo $name;?>
4：PHP的值传回页面
在HTML中插入PHP语言，可以调用PHP中变量的值，也可用Smarty（推荐）。Smarty是一个使用PHP写出来的模板引擎，是目前业界最著名的PHP模板引擎之一。它分离了逻辑代码和外在的内容，提供了一种易于管理和使用的方法，用来将原本与HTML代码混杂在一起PHP代码逻辑分离。简单的讲，目的就是要使PHP程序员同前端人员分离，使程序员改变程序的逻辑内容不会影响到前端人员的页面设计，前端人员重新修改页面不会影响到程序的程序逻辑，这在多人合作的项目中显的尤为重要。参考百度百科：http://baike.baidu.com/link?url=H_UWgGsEuzkSQl_czIkfWPc0pwf9dQc3X-lXUq5l98UYBqr_MrHftQzkdxr6ZnYI87uF2jksgpetTceUOhW-na
有了以上这些，不管是HTML页面里的值还是JS中变量的值，都可以轻松的传入PHP，当然，PHP的值也可传到想要的地方。
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