20180822 Ajax Post Method request

1. What is Ajax

ajax:asynchronous JavaScript and XML ( asynchronous js and XML)

It can be used with the server ( asynchronous / Synchronous ) One of the techniques of interaction .

the language carrier of Ajax is JavaScript.

Maximum features: page does not refresh

Receive Server return information

what information can Ajax receive?

A: The information that the browser can receive can be received by Ajax, such as strings,HTML tags,css style content,xml content , JSON content and so on.

4. Ajax requests for Get and post methods

Ajax Object . Open (get/post, request address );

4.1 The difference between the two

① The amount of data passed to the server,get up to 2k

there is no limit to the post principle,php.ini is limited to 8M

② security,post transfer data is more secure

③ pass data in a different form

Get method passes parameters in the form of a request string behind a URL address

HTTP// URL /index.php? Name=tom&age=23&addr=beijing

The blue part is the request string, which is the " name - value " pair, with the & symbolic connection in the middle.

The post method is to send the form form data to the request and pass it to the server in XML form .

in JavaScript, information such as special symbols can be encoded by encodeURIComponent () .

Post

20180822 Ajax Post Method request