href= ' # ' and href= ' # # # ' differences as well as javascript:; with javascript:void (0) Introduction to use

href= ' # ':

We sometimes write such a connection <a href= "#" >xxx</a> in order not to happen jump, actually is not quite correct, because href= "#", contains a location information. The default anchor is #top, which is the top of the Web page, in fact it happened to jump, Each time to jump to the top of the page, if your page has only one screen, of course, but there will be a problem, because each click has a jump, so, if the frequent click will cause the browser giant slow or even crash.

Href= ' # # # ':

This is a personal habit of the problem, explain it will understand that based on href= "#" is the location of the anchor is the ID of top, the equivalent of href= "#top", so href= ' # # ': It means to jump to the stroke as # #的位置, but this position does not exist, solid does not happen to jump, In this case you can use a variety of writing, as long as the anchor point does not exist to achieve the effect.

Javascript:void (0);:

The void operator uses the following format:

• Javascript:void (Expression_r_r)

• Javascript:void Expression_r_r

Expression_r_r is an expression of the JavaScript standard to be computed. Parentheses on the outside of the expression are optional, but writing is a good habit. We can use the void operator to specify hyperlinks. The expression is evaluated but does not load anything at the current document. The code for the polygon creates a hyperlink that doesn't happen when the user clicks it. void (0) evaluates to 0 when the user clicks on the link, but does not have any effect on JavaScript.

<a href= "javascript:void (0)" > Click here Nothing will happen </a>

That is, you can use void (0) to perform some processing but not to refresh the page as a whole, but be careful when you need to refresh the page.
In fact, we can use <a href= "Javascript:void (Document.form.submit ())", this sentence will be a submit operation. Then what situation 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 before using void (0), it is best to think about whether this page needs a whole refresh.

It is said that some cases have browser-compatible bugs, but do not know what is, when it appears, Sina Weibo is written by javascript:void (0);

javascript:;:

This and javascript:void (0); Basically, the only difference is that there is no browser-compatible BUG,QQ space that many are written in javascript:;

Here's a look at some specific uses:

• <a href= "javascript:void (0)" onclick= "window.open ()" > Click on the link, the page does not move, only the link is opened. Javascript:void (0) represents only a dead link

• <a href= "#" onclick= "Javascript:return false;" > function as above, different browsers will have differences.

There are several ways to open a new window link:

• window.open ("url")

• Using Custom Functions

<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)" >LINK_TEST</a>

• Window.location.href= ""

href= ' # ' and href= ' # # # ' differences as well as javascript:; with javascript:void (0) Introduction to use