The void is an important keyword in JavaScript. which can be used as an operator. which may be any type of data for access. It returns undefined values.
Syntax
<head>
<script type = 'text/javascript'>
void func(){
javascript:void func()
} // or:
void(func())
javascript:void(func())
</script>
</head>
The most common use of void is in client-side JavaScript URLs. we can not change the page after clicking the link then we can add these void keywords on the click event.
<html>
<head>
<script type = 'text/javascript'>
</script>
</head>
<body>
<p>Click the following, This won't react at all...</p>
<a href = 'javascript:void(alert('Warning !!!'))'>Click me!</a>
</body>
</html>
<html>
<head>
<script type = 'text/javascript'>
</script>
</head>
<body>
<a href = 'javascript:void(0)'>Click me !!!</a>
</body>
</html>
