Get and set attributes
getAttribute
object.getAttribute(attribute)
Note: The getAttribute method does not belong to the document object, it can only be called through the element node object.
setAttribute
object.setAttribute(attribute,value)
例子：
var shopping = document.getElementById("purchases");
shopping.setAttribute("title","a list of goods");
The reference article is quoted from Script House: http://www.jb51.net/article/47040.htm
There is also a W3cschool, as shown in the figure:
The other is from W3cschool:
