1, primeval Ajax
Be sure to understand the background of the emergence of Ajax
Ajax query data back-end interface through url, do the parsing and update data in a local front-end
1, frame hidden iframe way to achieve partial page update --- just for a better user experience
Access backstage interface data displayed in the iframe page, refresh the page does not call the shots, but also refresh the page actually look at the upper left corner of going round in circles
2, Ajax asynchronous requests, truly partial page refresh, do not jump, do not turn left corner of the small circle
Ajax original wording --- note abbreviation of ajax
3, the server back into the xml data format
The parsing process is very troublesome, so this data format is rarely used.
4, the background data return data mainstream style: json format data
Make the interface a json format (in fact, after calling the url returns data, json format, not the full page)
5, ajax asynchronous request
js execution: single-threaded (from top to bottom rows analysis execution) + event queue (down after executing the code from the event queue, then the right way browser process)
6, Ajax native package
