Differences between synchronous and asynchronous

Differences between synchronous and asynchronous Reprinted from: http://blog.csdn.net/lmhcn/archive/2006/10/08/1325941.aspx For example: Normal B/S mode (synchronous) Ajax technology (asynchronous) Synchronization: submit a request, wait for the server to process, and return the result. The client browser cannot do anything during this period. Asynchronous: requests are triggered through events-> server processing (this is what the browser can do)-> processing is complete Bytes -------------------------------------------------------------------------------------------------------------------- Synchronization means that you ask me to go to dinner. When I hear it, I will go to dinner with you. If I don't hear it, you will not stop calling until I tell you to hear it. Asynchronous mode means that you call me and then eat on your own. After receiving the message, I may leave immediately or wait until I get off work. Therefore, if I want to invite you to dinner, I will use the synchronous method. If I want to invite you to dinner, I will use the asynchronous method, so that you can save money. Bytes -------------------------------------------------------------------------------------------------------------------- For example, synchronous message sending during a call is asynchronous.