Javascript in js: void (0) usage details _ javascript skills

Source: Internet
Author: User
Void (0) is used to execute some processing, but does not refresh the page as a whole, the following small series will detail the meaning of javascript: void (0) in js, for more information, see javascript: void (0. For example:

The code is as follows:



This indicates that the link is not redirected and the onClick event is executed.

I want to use the following common ajax code:

The code is as follows:


Here


But what does void (0) mean?

In Javascript, void is an operator that specifies to calculate an expression but does not return a value.

The format of the void operator is as follows:

1. javascript: void (expression)
2. javascript: void expression

Expression is a standard Javascript expression to be calculated. Parentheses outside the expression are optional, but it is a good habit to write them. (Implement version Navigator 3.0)

You use the void operator to specify the hyperlink. The expression is calculated, but no content is loaded in the current document.

The following code creates a hyperlink that will not happen to users in the future. When a user links, void (0) is calculated as 0, but Javascript has no effect.

The code is as follows:


Nothing happens here.

The following code creates a hyperlink. a form is submitted when a user opens a ticket.

The code is as follows:



Submit a form here


A href = # several methods to differentiate connections with a href = javascript: void (0)

# Contains a location information

The default anchor is # top, that is, the top of the web page

Javascript: void (0) only indicates a dead link.

This is why sometimes a long page browsing link is clearly # yes

Beat to top

This is not the case with javascript: void (0 ).

Therefore, it is best to use void (0) when calling the script)

Or

And so on

Links

1. window. open (''url '')

2. use UDFs

Script function openWin (tag, obj) {obj.tar get = "_ blank"; obj. href = "Web/Substation. aspx? Stationno = "+ tag; obj. click ();}" script "Xuzhou window. location. href = ""

Summary:

1 void (0) is used to execute some processing, but the page is not refreshed as a whole, but it is necessary to carefully refresh the page.

2. in fact, we can use this statement to perform a submit operation. Under what circumstances is there a lot of void (0), no matter what the new version is, of course, Ajax. if you look at the Ajax web page, generally, you will see a lot of void (0), :), so before using void (0), it is best to think about whether the page needs to be refreshed as a whole.

3. to put it bluntly, href = "#" will refresh the page while href = "javascript: void (0)" will not

The above content introduces the meaning of javascript: void (0) in js, and I hope it will be helpful to you.

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