很简单的js下拉框联动
</p><p>使用innerHTML，IE浏览器不支持这种方法的，所以改进方法：</p><p><br></p><p></p><textarea readonly name="code" class="html"><!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>Untitled Document</title><script>function setSecond(obj){var val = obj.value;if(val == 'en'){var sec = document.getElementById('second');sec.options[0] = new Option("one","one");sec.options[1] = new Option("two","two");}else{var sec = document.getElementById('second');sec.options[0] = new Option("一","one");sec.options[1] = new Option("二","two");//可设置循环配置，也可一个一个配置}}</script></head><body><div> <select id="first" onchange="setSecond(this)"> <option value="en">en</option> <option value="zh">zh</option> </select> </div><div> <select id="second"> </select> </div></body></html>可以兼容火狐，IE等
