The difference between the jquery id selector and the class selector is often discussed.

The difference between the jquery id selector and the class selector is often discussed.

Example:

<! DOCTYPE html> 
The size () method returns the number of DOM objects.
<! DOCTYPE html> 
That is:Id is unique. Even if multiple elements with the same id exist, the jquery selector can only obtain one of them. Therefore: to set the id action in jquery, the id can only appear once on the page.
For CSS Styles, you can select all DOM objects with id = box on the page:
#box {  color: red;};
The Writing Method of the jQuery selector is very similar to that of the CSS selector, but the functions are different:
CSS adds a single style after finding an element, while jquery adds action behavior.
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