JS javascript:void (0) usage detailed _javascript skill

Javascript:void (0) means no action. Such as:

Copy Code code as follows:

<a href= "javascript:void (0);" onclick= "alert (' OK ');" ></a>

This indicates that the link does not do a jump action, execution onclick event.

The code that I want to use for Ajax is common:

Copy Code code as follows:

<a href= "Javascript:dotest2 (); void (0);" >here</a>

But what does void (0) mean here?

In JavaScript, Void is an operator that specifies that you want to evaluate an expression but not return a value.

void operator usage format is as follows:

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

Expression is an expression of the Javascript standard to compute. The parentheses on the outer side of the expression are optional, but it is a good habit to write. (Implementation version Navigator 3.0)

You specify the hyperlink using the void operator. The expression is evaluated but no content is loaded at the current document.

The following code creates a hyperlink that will not happen after the user. When the user links, void (0) evaluates to 0, but there is no effect on Javascript.

Copy Code code as follows:

<a href= "javascript:void (0)" > single here Nothing's going to happen </A>

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

Copy Code code as follows:

<a href= "Javascript:void (Document.form.submit ())" >
Submit form here alone </A>

A href= #与 a href=javascript:void (0) A few ways of distinguishing links

#包含了一个位置信息

The default anchor is #top, the upper end of the Web page.

and javascript:void (0) only represents a dead link

This is why sometimes the page is very long browsing links is clearly

Beat to the top of the page

and javascript:void (0) is not so

So the best time to invoke a script is void (0)

or <input onclick>.

<div onclick>, etc.

Several ways to link

1.window.open (' url ')

2. Use Custom function

<script>
   function Openwin (tag,obj)
   {
    obj.target= "_blank";
    Obj.href = "web/substation/substation.aspx?stationno=" +tag;
    Obj.click ();
   }
  </script>

<a href= "javascript:void (0)" onclick= "Openwin (3,this)" > Xuzhou </a>

Window.location.href= ""

Summarize:

1 void (0) is used to perform some processing, but does not refresh the page as a whole, but when you need to refresh the page, it's very careful.

2 In fact, we can use <a href= "javascript:void (Document.form.submit)" ", this sentence will be a submit operation. What is the case with void (0) More? No refresh, of course, Ajax, look at the AJAX Web page, you will generally see a lot of void (0),: So in the use of void (0) before, it is best to think about whether this page needs to refresh the whole

3 Plainly, href= "#" This form will refresh the page as a whole, while href= "javascript:void (0)" will not

The above content introduces the meaning of JS in javascript:void (0), hope to be helpful to everybody.