A small collection of implementation methods to use js to return to the previous page under asp.net_javascript skills

Method 1:
In the source code in aspx in asp.net

Brief analysis: This uses HTML controls. It only needs to call a method in javascript through an onclick event. This is the simplest, and it is also suitable for static pages, ASP pages, etc. .
Method 2:
Use Response.write
If you have a certain understanding of ASP, then you will be familiar with Response.write. Method 1 is to implement it directly in the HTML page. Then this is implemented in the background environment (this statement does not seem to be very standardized, haha)

Why should the value of -2 be used here? I personally think it is like this: because in asp.net In the page, when you press a button, because page.postback will be implemented in the page, the page is actually refreshed twice. What we want is the first time, so... ..

Method 3
Use Response.Redirect() or server.transfer()

Add
if(!IsPostBack)
ViewState["retu to page_load "]=Request.UrlReferrer.ToString();
And in the return button event
Response.Redirect(ViewState["retu"].ToString());
or Server.Transfer (ViewState[ "retu"].ToString());

Analysis:
Request.UrlReferrer can obtain information about the URL last requested by the client. When we use this, it is best to make a Judgment
if(ViewState["UrlReferrer"]!=null)
Response.Redirect(ViewState["UrlReferrer"].ToString();
else
{
Response.write(" Sorry, the current page number is the first page ");

This is a little easier
}
Also note when using Request.UrlReferrer:
1. If the previous page uses document The .location method navigates to the current page, and Request.UrlReferrer returns a null value
2. If there are two pages A and B, directly request page A in the browser, and navigate to page B in the Page_Load event of page A. Then Request.UrlReferrer returns empty. Because the page has not been initialized in the Page_load event, the information of the current page cannot be recorded, and the information of the previous page cannot be obtained by navigating to page b
3. Clicking the refresh button will not change Request.UrlReferrer

Method 4:
This method is probably rarely used by people, but I tried it and it was pretty good.
Enter in the onClick event of the button
this.RegisterClientScriptBlock("e", "< script language=javascript>history.go(-2);");
You can also return to the previous page

Method 5

Method 6

Here we also need to talk about using Javascript to implement and use Response.redirect() A little difference to achieve. If you want to retain the data you filled in when using the form, you need to use history.go(); this stuff. If you just return it directly without doing any operation, you can use response.redirect().