-------in A--------
<script>top.location.href='B?value=xxxxx';</script>-------in B--------
<script>top.location.href='C?value=xxxxx';</script>
<script>top.location.href='B?value=xxxxx';</script>-------in B--------
<script>top.location.href='C?value=xxxxx';</script>
<script>top.location.href='B?value=xxxx';</script>----in B----
<script>top.location.href='C?value=xxxx';</script>
在B中写上<script>top.location.href='C?value=<?echo $value?>';</script>
试试,然后在地址栏里面看看参数传递了没有