The response data type of Ajax

In XMLHttpRequest, you can receive response data in two ways, using Responsexml and ResponseText.

Using the Responsexml method, you can receive the XML-formatted string returned in the background, and the browser automatically resolves it to an XML document object, so we can directly return the data using the DOM method, such as:

Xml:

<person>

<id>1</id>

</person>

Js:

var xmldom = Xhr.responsexml;

var persons = Xmldom.getelemenstbytagname (' person ');

Using the ResponseText method, the received is a plain text string, such as: "<person><id>1</id></person>";

The Ajax module in jquery can be used to process the returned data by setting the datatype:

DATATYPE:XMLL, jquery returns an XML object (this is because the responsexml is used internally);

When datatype:html, jquery returns plain text HTML, in the returned HTML text, such as when the script is included, when inserting HTML into the DOM tree, scripts execute (this is the difference between HTML and text);

Datatype:json,jquery returns the JSON object;

The response data type of Ajax