A href = # differences from a href = javascript: void (0) and the meaning of location. href

1. Location:

Is an image in a Windows window. Its main function is to direct the current webpage to another
Href is a property of a Web page. It can be used to direct another web page and refresh the page.

 

2.

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.

 

"#" The default anchor that contains a location information is # top, that is, the top of the web page, and javascript: void (0) it only indicates a dead link. This is why sometimes the page has a long browsing link. It is clearly # But the page jumps to the top and javascript: void (0) this is not the case. It is best to use void (0) or <input onclick> <Div onclick> to open a new window link when calling the script. window. open ('url') 2. use custom functions <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 = "" ------------------------------------------------------------------------------- if it is a #, it will jump to the top of the page. You can add several solutions to your favorites:
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 )------------------------------------------------------------------------------- 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: void in Javascript 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)"> clicking here does not happen. </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), but when you need to refresh the page, you should 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"