JavaScript uses Microsoft. XMLDOM to read remote XML file content

Why does JS use Microsoft. XMLDOM to read remote XML files? As a matter of fact, we can see from an example that we have recently created an ajax page to remotely read weather information. Weather Information is the content of a remote website and is stored in XML files, therefore, to implement AJAX, We need to read the XML file in JS. In the beginning, it is difficult. In fact, we do not think so.

In the above Code, http: // *****. com/ajax/weather. asp? Subcode = b55 is the weather XML Information of a remote website. xml generated by ASP is used. The XMLDOM component is called to read the data directly, and the selectSingleNode method is called to read the content of the last node, that's it, right?