What does href="#" mean?

<a href="#" onclick="process1()">Start your performance</a> 

Function: Another use 
of bookmarks Create bookmark
 syntax: <a name="bookmark name">text</a> 

link to Bookmark (use)
 syntax for the same page: <a href="#bookmark name">text of the link</a> 

bookmark
 syntax for linking to a different page: <a href="address of the linked file#bookmark name">link The text</a> (note the quotation marks and #) 

under normal circumstances, click: <a href="#bookmark name">Link text</a> this link, the cursor will automatically jump to this page:< a name="bookmark name">text</a> location. 

But if you write: <a href="#">text of the link</a> without writing the bookmark name, it actually doesn't jump to anything. 
Generally, href="#" will only be reached when <a onclick="">. Href="#" means linking to the current page, which is actually meaningless, and the page will not be refreshed at the 

end: this is to give The onclick button adds an effect, such as moving the mouse up from an arrow to a small hand