代码如下：
<form action="file:///c|/"><input type="submit" value="c:\ drive"></form> <p> <form action="file:///a|/"><input type="submit" value="a:\ drive"></form> <p> <form action="file:///b|/"><input type="submit" value="b:\ drive"></form> <p> <form action="file:///d|/"><input type="submit" value="d:\ drive"></form> <p> <form action="file:///e|/"><input type="submit" value="e:\ drive"></form>