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This article introduces the knowledge of "how to use javascript's void". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Other people's JavaScript scripts can see code like this:

Here

But what exactly does void (0) mean here?

Void in JavaScript is an operator that specifies that an expression is evaluated but does not return a value.

The usage format of the void operator is as follows:

1. _ javascript:void (expression)

2. _ javascript:void expression

Expression is an expression of the JavaScript standard to evaluate. The parentheses on the outside of the expression are optional, but it is a good habit to write them.

You can use the void operator to specify hyperlinks. The expression is evaluated but nothing is loaded in the current document.

The following code creates a hyperlink that nothing happens when the user clicks. When the user clicks on the link, void (0) is calculated as 0, but has no effect on JavaScript.

Click here and nothing will happen.

The following code creates a hyperlink that submits the form when the user clicks.

Click here to submit the form

The default anchor for # containing location information is # top, the top of the page, while _ javascript:void (0) simply represents a dead link. This is why sometimes the page is very long and the browsing link is obviously # but jumps to the top of the page, but this is not the case with _ javascript:void (0), so it is best to use void (0) when calling the script, or so on.

Void operator

Avoid the expression returning a value.

The expression parameter is any valid JScript expression.

Description

The void operator evaluates the expression and returns undefined. This operator is most useful when you want to find the value of an expression but do not want the rest of the script to see the result

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