Google analytics cookie

hi i to am develop a web application that needs to maintain a persistent connection through cookie methods, but when i retrieve the cookie from the server and explore the cookie it doesn't seem to be the original one with the text generated by ga.js JavaScript. the web application is on client开发者_运维技巧 side, there is a way that i can execute the JavaScript when I download the page to match the original cookie like a web browser?

Thx.