Use JS to get the URL address of the previous page

In general, there is a return button on each page to return to the previous page with the following code:

<a href= "Javascript:history.go ( -1)" class= "Jsback" ></a>

The above code can actually satisfy our need to return to the previous page, but if we open this link from somewhere else, in fact there is no previous page, in order to enhance the user's experience, we can use JS to control when we click the Return button, the key code is as follows:

if (document.referrer = = =) {    $ ('. Jsback '). attr (' href ', '/');}

The above means that when we click on the judgment, if Document.referrer is an empty string, it will return to the home page, so that the user experience is better.

The Referrer:referrer property returns the URL of the document loaded into the current document, which is actually the previous page.

Use JS to get the URL address of the previous page