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What does Javascript:void(0) mean and how to use it in JavaScript?

黄舟Original: 2017-11-09 16:08:3310595browse

In our daily JavaScript development, we will encounter code like javascript:void(0). Many friends are confused when they see this and don’t know what it means. So this What does javascript:void(0) mean in JavaScript? Today we will take you to understand it together!

1. What does Javascript:void(0) mean and its meaning

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

But what does void(0) here mean?

void operator usage format is as follows:

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

expression is a Javascript standard expression to be evaluated. The parentheses outside the expression are optional, but are a good practice to write. (Implementation version Navigator 3.0 )

The syntax format is as follows:

<head>
<script type="text/javascript">
<!--void func()javascript:void func()
或者
void(func())javascript:void(func())//-->
</script>
</head>

1. Usage of Javascript:void(0)

javascript:void(0) means no action is taken. For example:

<a href="javascript:void(0);" onclick="alert(&#39;ok&#39;);"></a>

This means that this link does not jump and executes the onClick event.

I think this code is common among those who have used ajax:

<a href="javascript:doTest2();void(0);">here</a>

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)">徐州</a>
 
window.location.href=""

Summary:

1 void(0) is used to perform certain processing, but does not refresh the page as a whole In this case, but if you need to refresh the page, you need to be careful.

2 In fact, we can use 870cd383f150d4ad83c7c7790d241cd0, this sentence will perform a submit operation. So under what circumstances is void(0) used more often? Without refresh, of course it is Ajax. If you look at the Ajax web page, you will generally see a lot of void(0), :), so when using void(0 ) before, it is best to think about whether this page needs to be refreshed as a whole

3 To put it bluntly, href="#" will refresh the page as a whole, while href="javascript:void(0)" Otherwise

Related recommendations:

1.Let’s talk about javascript that is often used in static pages: ; and javascript:void(0)

2. Analysis of the difference between a tag href=# and href=javascript:void(0) in html

3.Use javascript:void(0) with caution, why is it not good to write like this

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