JavaScript implements automatic jump to a page after x seconds_javascript skills

I learned a new technology while watching a video today, that is, when we click "Submit" or "Confirm" on a page, it will automatically jump to a page.
After searching on the Internet, there are many ways to deal with this technology. I only wrote down the three methods I learned in the video:
1. Use a response.sendRedirect("target page.jsp.htm "); to achieve direct jump;
2. Sometimes we need some prompts, such as "It will jump automatically after x seconds. If there is no jump, please click here", you can call Delay Go in Snippets in myeclipse To URL. The following code will be automatically generated:

Copy code The code is as follows:

<script language="JavaScript1.2" type="text/javascript">
<!--
// Place this in the 'head' section of your page.
function delayURL(url, time ) {
setTimeout("top.location.href='" url "'", time);
}
//-->
</script>
< !-- Place this in the 'body' section -->
<a href="javascript:" onClick="delayURL('myPage.html','2000')">My Delayed Link</ a>

Modify this code to:

Copy the code The code is as follows:

<script language="JavaScript1.2" type="text/javascript">
function delayURL(url, time) {
setTimeout("top.location.href='" url "'", time);
}
</script>
<span id="time" style="background: red">3</span>
seconds later Automatically jump, if not, please click the link below
<a href="target page.jsp">target page</a>
<script type="text/javascript"&gt ;
delayURL("http://www.hualai.net.cn", 3000);
</script>

Then it will jump directly after 3 seconds Go to the "Target Page". This method is to set a few seconds to jump and the page will not change during this process. For example, set it to 3 seconds, and then as time changes, 3 turns to 2 and then to 1 until it jumps. Please follow Look at the third method.
3. Modify the code in method 2 to:

Copy the code The code is as follows:

<script language="JavaScript1.2" type="text/javascript">
function delayURL(url) {
var delay=document.getElementById("time").innerHTML;
//The last innerHTML cannot be lost, otherwise delay is an object
if(delay>0){
delay--;
document.getElementById("time").innerHTML=delay;
} else{
window.top.location.href=url;
}
setTimeout("delayURL('" url "')", 1000);
//1000 milliseconds here is every Jump once per second
}
</script>
<span id="time" style="background: red">3</span>
Automatically jump after seconds , if it does not jump, please click the link below
<a href="target page.jsp">topic list</a>
<script type="text/javascript">
delayURL("http://www.hualai.net.cn/news/knowledge/265.html");
</script>

The effect achieved by this method is After clicking submit on the previous page, you will jump to this page. After 3 seconds (this 3 will decrease to 0), you will jump to the target page.