Request.getQueryString()
Syntax

Request.getQueryString()

Returns

The query string corresponding to the current client request.

Description

The query string consists of the parameters following the URL. For example, if the client's browser was directed at http://servername/webname/pagename.csp?paramName=paramValue, the query string would be paramName=paramValue.

Example 
   response.write("QueryString: " + Request.getQueryString());
   // this code called from a webcall function named main()
   // would print: "QueryString: _fn=main"
Related Topics

Request Object, Request.getParameter(), Request.getRequestURI()
本质就是获取带参数查询