用于隐藏下拉列表选项的Javascript解决方案

Edit: Thanks everybody, but nothing seems to work. I am inserting this code in a file that I know is being used and that contains other javascript blocks normally formatted, and this still doesn't work. It works in a fiddle, but not on my code. I guess this is too specific to the platform and extension that I'm trying to modify (this is part of a Magento checkout step modified by a third party extension). I will start looking into replacing the list with a manually generated one. Thanks again.Edit: Thanks everybody, but nothing seems to wo