Ajax returns JavaScript to the page for execution

Guidance:
If there is no data after the query due to a requirement, an alert will be returned to the user. I am too lazy to write alert on the page. In addition, a lot of data is written.Code.
After many experiments, the original eval () function is exactly what I want.
Javascript:
VaR TXT = http_request.responsetext;
Eval (txt );
Action:
Response. getwriter (). Write ("Var A = 1; var B = 2; alert (a + B); tttt ();");
In this way, you can execute the script or a method tttt () on the page ();
It's really easy to use, hahaha.

This article is transferred from
Http://blog.csdn.net/wonder4/archive/2006/12/02/1426377.aspx