ajax2—php (28), ajax2php28_PHP tutorial

ajax2—php (28), ajax2php28

8 Use post to transfer data

l xmlhttp.open("post","action.php");

l xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

l xmlhttp.send(data);

1. What are the differences between get and post requests?

Transfer data size is different:

Get：2k

Post: original limit

Different ways of transmitting data:

Get: behind url

Post: after a blank line

Transfer data formats are different:

Get: text string

Post: text string, binary

Get request:

Post request:

Php code:

The packet capture results are as follows:

As you can see from the picture above, this http request

1) Post request

2) Use content-type request header

3) The parameters are placed after the blank line

I made some modifications to the php code in the above question and found that the latest results can be returned immediately.

Post requests will not cause caching issues.

Example question:

Use Ajax to complete data entry

9. Application of xml in ajax

In ajax, for simple returned data, we can use responseText to get the value

For large batches and complex data, xml or json technology needs to be used

Corresponding parsing code:

l var xml=xmlHttp.responseXML;

l node=xml.getElementByTagName(“TagName”);

l node[0].childNodes[0].nodeValue;

http://www.bkjia.com/PHPjc/1001460.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1001460.htmlTechArticleajax2—php (28), ajax2php28 8. Use post to transmit data lxmlhttp.open("post",action.php "); lxmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); lxmlht...