Introduction to the use of javascript:; and javascript:void(0)

Introduction to the use of javascript:; and javascript:void(0)_javascript skills

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Release： 2016-05-16 17:32:46

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href="#", contains a location information. The default anchor is #top, which is the top of the web page. Clicking this link quickly will cause the browser to be extremely slow or even crash.

Of course we usually use three href="###", but after reading this article we can use javascript:; (one colon and one semicolon)

In JavaScript, void is an operator that specifies to evaluate an expression but does not return a value.

javascript:; is better, javascript:void(0); is said to have browser compatibility bugs in some cases. (I don’t know when this bug will appear. If you know about it, please give me some advice).

It can be written as javascript:;, many in QQ space are written as javascript:;
I feel there is no difference between the two, they both execute an empty event.
javascript:; is even missing 7 characters, haha.

Sina Weibo writes javascript:void(0);

I used to write javascript:void(0); but now I write all javascript:;

a href="#"> After clicking the link, the page will scroll up to the top of the page, #The default anchor point is #TOP
After clicking the link, the page does not move and only the link is opened
The function is the same as above, but different browsers will have differences.

After clicking the link, if you don’t want the page to scroll to the top of the page, use href="javascript:void(0)" instead of href="#". Return false has a similar effect

Detailed explanation of the difference between href="#" and href="javascript:void(0)"

"#" contains a location information
The default anchor point is #top, which is the top of the web page
And javascript:void(0) just means a dead link
This is why sometimes the page is very long and the browsing link is clearly # but it jumps to the top of the page
This is not the case with javascript:void(0)
So it’s best to use void(0)
when calling a script Or

etc
Several ways to open links in new windows
1.window.open('url')
2. Use custom functions

Copy code The code is as follows:

        function openWin(tag,obj)
            {
               obj.target="_blank";
            obj.href = "Web/Substation/Substation.aspx?stationno=" tag;
                 obj.click();
}
LINK_TEST

window.location.href=""
-------------------------------------------------- --------------------------
If it is a #, it will jump to the top. Several solutions in my personal collection:
1:
2:
3:
4:
5: (It seems that it cannot be displayed in FF)
-------------------------------------------------- --------------------------
Use JavaScript with caution:void(0)
When I was debugging CGI today, it was clear that the CGI program had been executed and the final result was correct, but the page would not refresh. Tested under FireFox2.0, the result is normal, but IE6 does not refresh! After careful investigation, I found that the cgi page link is only a sample , the problem lies in this void(0) on! Let us first take a look at the meaning of void(0) in JavaScript:
void is an operator in JavaScript that specifies to evaluate an expression but does not return a value.
The void operator usage format is as follows:
1. javascript:void (expression_r_r)
2. javascript:void expression_r_r
expression_r_r is a JavaScript standard expression to be evaluated. The parentheses outside the expression are optional, but it is a good practice to write them. We can specify hyperlinks using void operator. The expression is evaluated but nothing is loaded into the current document. The code above creates a hyperlink that does nothing when the user clicks on it. When the user clicks the link, void(0) evaluates to 0, but has no effect on JavaScript.
Click here and nothing will happen
In other words, if you want to perform some processing without refreshing the page as a whole, you can use void(0), but if you need to refresh the page, you need to be careful.
In fact, we can use , which 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) ), it’s best to think about whether this page needs to be refreshed as a whole.

When using javascript, we usually pass something like:
Submit
method, calling the javascript method through a pseudo link. One problem with this method is:
Although the page will not jump when clicking the link, the scroll bar will scroll up. The solution is to return false.
As shown below:
Submit

You can also use ###

a href="javascript:void(0)" onclick="javascript:method;return false;"Submit
javascript:void(0) will not jump up:)

Another way is #this
a href="#this" onclick="javascript:method"