<html> <head></head> <body> <select id="select1" size=6> <option>111</option> <option>333</option> <option>444</option> <option>222</option> <option>333</option> </select> <input type=button value="sort" onclick="sort();"> </html> [Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]