1. A breadcrumb method for a website, said method comprising: in response to a request for visiting the website, a processor of a computer system generating a breadcrumb root node in a tree structure; after said generating the breadcrumb root node and in response to receiving a request for visiting a first web task associated with the website, said processor generating a first task node in the tree structure at the breadcrumb root node; after said generating the first task node and in response to sequentially receiving requests for multiple subtasks of the first web task, said processor sequentially establishing in the tree structure multiple subtask nodes of the first task node, wherein the subtask nodes of the multiple subtask nodes of the first task node are respectively associated with the subtasks of the multiple subtasks of the first web task and are sequentially connected to the first task node according to a sequential order of the sequentially received requests for the multiple subtasks of the first web task; and after said sequentially establishing in the tree structure the multiple subtask nodes of the first task node, said processor processing the multiple subtask nodes of the first task node based a policy of the first web task.