Explanation of the differences between a href = # And a href = javascript: void (0)

Explanation of the differences between a href = # And a href = javascript: void (0)

A href = "#"> after clicking the link, the page will be rolled up to the TOP, # The default anchor is # TOP

<A href = "javascript: void (0)" onClick = "window. open ()"> after you click the link, the page does not move and only opens the link.

<A href = "#" onclick = "javascript: return false;"> different browsers have different functions.

After clicking the link, if you do not want to roll the page to the top, you can use href = "javascript: void (0)" instead of href = "#". return false also plays a similar role.

Details about the differences between href = "#" And 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 # But the page jumps to the top
This is not the case with javascript: void (0 ).
Therefore, it is best to use void (0) when calling the script)
Or <input onclick>
<Div onclick> and so on

How to open a new window Link

1. window. open ('url ')
2. Use udfs

The Code is as follows:
<Script>
Function openWin (tag, obj)
{
Obj.tar get = "_ blank ";
Obj. href = "Web/Substation. aspx? Stationno = "+ tag;
Obj. click ();
}
</Script>
<A href = "javascript: void (0)" onclick = "openWin (3, this)"> LINK_TEST </a>

Window. location. href = ""
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If it is a #, it will jump to the top of the situation, personal collections of several solutions:
1: <a href = "####"> </a>
2: <a href = "javascript: void (0)"> </a>
3: <a href = "javascript: void (null)"> </a>
4: <a href = "#" onclick = "return false"> </a>
5: <span style = "cursor: hand"> </span> (it seems that it cannot be displayed in FF)
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Use JavaScript with caution: void (0)

When debugging CGI today, it is clear that the CGI program has been executed and the final result is correct, but the page is not refreshed. The test results in FireFox2.0 are normal, but IE6 is not refreshed! After careful investigation, we found that the cgi page is linked to <a href = "javaScript: void (0)" OnClick = "XXX_Func ();"...> Only a sample </a>, the problem lies in this void (0! Let's take a look at the meaning of void (0) in JavaScript:
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_r_r)
2. javascript: void expression_r_r

Expression_r_r is a standard JavaScript expression to be calculated. Parentheses outside the expression are optional, but it is a good habit to write. You can use the void operator to specify a hyperlink. The expression is calculated, but no content is loaded in the current document. The code above creates a hyperlink, and nothing will happen after the user clicks. When a user clicks a link, void (0) is calculated as 0, but it has no effect on JavaScript.
<A href = "javascript: void (0)"> click here. </a>
That is to say, if you want to perform some processing, but do not refresh the page as a whole, you can use void (0). However, when you need to refresh the page, you have to be careful.
In fact, we can use <a href = "javascript: void (document. form. submit ()"> to perform a submit operation. Under what circumstances will void (0) be used more often, without refreshing the new version? Of course it is Ajax. If you look at Ajax web pages, you will usually see a lot of void (0 ), :), so before using void (0), You 'd better first think about whether the page needs to be refreshed as a whole.

When using javascript, we usually use the following methods:

<A href = "#" onclick = "javascript: Method"> submit </a>
To call the javascript method through a pseudo link. The problem with this method is:
Although the page is not redirected when you click the link, the scroll bar will roll up. The solution is to return a false value.

As follows:

<A href = "#" onclick = "javascript: method; return false;"> submit </a>

It can also be used ###

A href = "javascript: void (0)" onclick = "javascript: method; return false;" Submit
Javascript: void (0) won't jump up :)

Another method is # this

A href = "# this" onclick = "javascript: Method"