javascript void

javascript:void(0) Meaning

We often use code like javascript:void(0), so in JavaScript javascript:void What does (0) mean?

The most critical thing in javascript:void(0) is the void keyword. void is a very important keyword in JavaScript. This operator specifies to calculate an expression but does not return a value.

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##The syntax format is as follows:

< ;head>

The following code creates a hyperlink that does nothing when the user clicks on it.

     
  单此处什么也不会发生  

When the user links, void(0) evaluates to 0, but has no effect on Javascript.

In the following example, a warning message is displayed after the user clicks the link:

      
  
点击以下链接查看结果：
 点我!  

Run the program and try it

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In the following example, parameter a will return undefined:

      
  
点击以下按钮查看结果：
 
  
  

Run the program and try it

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The difference between href="#" and href="javascript:void(0)"

# Contains With a location information, the default anchor is #top, which is the top of the web page.

And javascript:void(0) only represents 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

     
  点我没有反应的!
 点我定位到指定位置! 
 ... 
 
尾部定位点
  

Run the program and try it