what does setattribute do in javascript code example

Example 1: javascript setattribute

element.setAttribute(<name>, <value>);
// ex
var aElement = document.querySelector("a"); 
aElement.setAttribute("href", "https://isitchristmas.com/"); 
// same as <a href="https://isitchristmas.com/"></a>

Example 2: setAttribute()

element.setAttribute(name, value);
element.setAttribute("style", "background-color: red;");

Example 3: set attribute javascript

Element.setAttribute(name, value);