Javascript:void (0) meaning

From rookie tutorial

The key in Javascript:void (0) is the Void keyword, which is a very important keyword in JavaScript, which specifies that an expression is evaluated but does not return a value.

<a href= "javascript:void (0)" > Click here Nothing will happen </a>

void () simply means that no value is returned, but the expression inside the parentheses is still to be run, as

<a href= "javascript:void (alert (' Warning!!! '))" > I!</a>.

　　

The difference between href= "#" and href= "javascript:void (0)"

# contains a location information, the default anchor is #top that is the top of the page.

and javascript:void (0), only represents a dead link.

When the page is long, it uses # to locate the page in the format:# + ID.

If you want to define a dead link please use Javascript:void (0).

Javascript:void (0) meaning