How can I assign JS parameters to PHP?

How can I assign JS parameters to PHP ?? Function & nbsp; getSig (openid, openkey, url, pf) {& nbsp; var & nbsp; sigStr & lt ;? Php & nbsp; echo & nbsp; get_sig (+ openid +, + openkey +, + url +, + pf +) & ask how to assign JS parameters to PHP ??

Function getSig (openid, openkey, url, pf ){

Var sigStr ="

 ";

}

How do I assign parameters in the getSig brackets to the get_sig of PHP?
I can't write anything in it .. Consultation methods
------ Solution --------------------
Php returns the page to the browser to execute js after execution on the server side. the parameters in js cannot be directly assigned to php.
Only ajax requests can be sent.