You can install this extension here:
https://chrome.google.com/webstore/detail/list-sorter/ekfniknfklfanjjjddebmpdeldjkdnnp
A sample item of config:
url
:http://www.liaohuqiu.net
container
:#J_Version .wdm-dropdown-list
list
:#J_Version .wdm-dropdown-list .wdm-dropdown-item
value
:find('span').html()