Header() page jump problem in php ci framework

When using the header function to jump, you can find the specified url and the page, but the page does not jump and the url remains unchanged. What is going on?
Request URL: http://localhost/login
Request Method: POST
Status Code:302
Request Headersview source
Accept:*/*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:zh-CN,zh;q=0.8
Connection:keep-alive
Content-Length: 67
Content-Type:application/x-www-form-urlencoded
Cookie:PHPSESSID=2k3ap23pdn68ecls5a1kgb8431
Host:localhost
Origin:http://localhost
Referer:http://localhost/
User-Agent:Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36
20f883e
role:student
this Is the original page to start

Request URL: http://localhost/student/index
Request Method:GET

Status Code:200 OK

Request Headersview source
Accept:*/*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:zh-CN,zh;q=0.8
Connection:keep-alive
Cookie:PHPSESSID=2k3ap23pdn68ecls5a1kgb8431
Host:localhost
Referer:http://localhost/
User-Agent:Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36
X-Requested-With:XMLHttpRequest
Response Headersview source
Connection:Keep-Alive
Content-Length:856
Content-Type:text/ html
Date:Mon, 18 Nov 2013 14:22:30 GMT
Keep-Alive:timeout=5, max=99
Server:Apache/2.4.4 (Win32) PHP/5.4.16
X-Powered-By: PHP/5.4.16
This is the page to jump to

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