ajax1—php (27), ajax1php27_PHP tutorial

ajax1—php (27), ajax1php27

1 Introduction

Web program working principle diagram:

Traditional web program working principle diagram:

2. Core Object

XMLHttpRequest

1. Create objects

Under different browsers, the way to create ajax objects is slightly different.

Under IE:

new ActiveXObject("Microsoft.XMLHTTP")

3. Ajax object related properties and methods:

1. Related methods:

l open(method,url)

Initialize ajax object

method: request method post, get

url: Request resource address

l setRequestHeader(header,value)

Set request header information

Header: header information

Value: value

l send(content)

Send request

Content: The parameters passed only need to be placed here when making a post request

2. Related attributes:

l readyState

Status code of the Ajax object, this status code will change at any time

0: Indicates that the object has been created but not initialized

1: Indicates that the object has been initialized but not sent

2: The send method has been called to make a request

3: Receiving data (part of it received)

4: Reception completed

l onreadystatechange

When the status code of the ajax object changes, the callback function triggered

l status

http response status code

l statusText

Text of http response

l responseText

Text of http response content

l responseXML

xml data of http response content

There are three main ways to transfer Ajax object data:

Text: responseText

Xml: responseXML

Json:responseText

http://www.bkjia.com/PHPjc/998221.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/998221.htmlTechArticleajax1—php (27), ajax1php27 An introduction to the working principle diagram of the web program: The working principle diagram of the traditional web program: 2. Core object XMLHttpRequest 1. Create objects in different browsers...