Syntax and usage of void operators in JavaScript _javascript tips

Void is an operator in JavaScript, and the syntax is as follows:
Javascript:void (expression)
Javascript:void expression
void evaluates the value of an expression, but discards the return value of an expression.
This expression is often used to make a link into a dead link:

Copy Code code as follows:

<a href = "javascript:void (0)" onclick = "func ()" > Dot i </a>

When you click on this link, no address jump occurs, and the OnClick function is executed.
The same results can be achieved in the following ways

Copy Code code as follows:

<a href = "#" onclick = "func (); return false;" > Dot i </a>

But "#" contains a location information, the default is to return to the top of the page, so in order to avoid this situation, you can add a return false statement in the onclick statement