JavaScript Void
javascript:void(0) Meaning
We often use codes such as javascript:void(0) , so what does javascript:void(0) mean in JavaScript ?
The most critical keyword in javascript:void(0) is the void keyword. Void is a very important keyword in JavaScript. This operator specifies that an expression is to be calculated but no value is returned.
The syntax format is as follows:
void func()
javascript:void func()
or
void(func())
javascript:void(func())
The following code creates a hyperlink, and nothing happens when the user clicks it.
Example
<a href="javascript:void(0)">Click here and nothing will happen</a>
When the user links, void(0) is calculated as 0, but there is no effect on Javascript.
In the following example, a warning message is displayed after the user clicks on the link:
Example
<p>Click the link below to view the results:</p> <a href="javascript:void(alert('Warning!!!'))">Click me!</a>
The parameter a in the following example will return undefined:
Example
function getValue(){ var a,b,c; a = void (b = 5, c = 7 ); document.write('a = '+ a +' b = '+ b +'c =' + c ); }
The difference between href="#" and href="javascript:void(0)"
# Contains a location information, the default anchor is #top, which is the top of the page.
And javascript:void(0), just means a dead link.
When the page is very long, # will be used to locate the specific location of the page, the format is: # + id .
If you want to define a dead link, please use javascript:void(0).
Example
<a href="javascript:void(0);">Click on what I did not respond!</a> <a href="#pos">Click me to locate the specified location!</a> <br> ... <br> <p id="pos">Tail anchor point</p>