The absolute path method used in JavaScript to get the current directory using the A tag

This article mainly introduces the JavaScript uses a tag to obtain the current directory absolute path method, this article explains the method to be quite special, needs the friend to be possible to refer to under

When it comes to path-related issues, everyone will go to the window.location and think that this object provides quite a lot of path information, which is commonly used to include:

1.location.href: Full URL of the current page
2.location.pathname: path name in current URL
3.location.hash: Anchor points in the current URL
4.location.search: Query parameters in the current URL

However, location does not have an attribute that directly obtains the absolute path of the current directory (without the filename). Through Google I found some wrong ways, such as the URL through "/" separated by the number of groups, the last item of the array is removed and then connected to a string. However, if a filename is not specified in the URL, the result is wrong.

Based on previous coding experience, the href attribute of a element always returns an absolute path, which means it has the ability to turn a relative path into an absolute path. Try it with the following code:

The code is as follows:
var a = document.createelement (' a ');
A.href = './';
alert (A.HREF);
A = null;
Unfortunately, this method is not valid under old IE 6/7, and when executing alert (A.HREF), the pop-up is still "./". Later, I found that some people in the StackOverflow also raised the problem, and the solution is very simple, as long as a through innerHTML injection can be:
The code is as follows:
var div = document.createelement (' div ');
div.innerhtml = ' <a href= './"></a>";
alert (DIV.FIRSTCHILD.HREF);
div = null;
One might ask: why not use regular expressions? My answer is: to consider whether there is a file name, there is no anchor point, there is no query parameters, this regular expression may be quite complex.