Browser injection prevention method, browser client and apparatus

A browser client, comprising:

• a network component, configured to initiate a network request to be sent to a server;
• an injection prevention component, specifically comprising:
• a chain table copying module, configured to copy a source layered service provider chain table of a current browser to obtain a first layered service provider chain table;
• a chain table converting module, configured to convert a source node to which access is not permitted, in the first layered service provider chain table, into a virtual node to obtain a converted second layered service provider chain table;
• wherein the virtual node implements an interface with each layered service provider and returns a null value;
• and
• a request control module, configured to control the network request to be transmitted by means of the second layered service provider chain table.