Detailed explanation of three common methods for HTML pages to automatically jump after 3 seconds

In practice, we often encounter a problem: how to automatically jump to the page after N seconds?
I encountered problems and searched for information myself, and summarized 3 methods
Method 1:
The simplest one: add code directly in the front:

     //3秒之后自动跳转到res.html，两个属于同一文件下面，要是需要跳转到jsp页面，就需要在url里面填写url地址 

Method 2:

You need to use the method in window:

setTimeout calculates an expression after the specified millisecond value.

Example:

window.setTimeout("alert('Hello, world')", 1000);

This is written in js code;

The specific implementation is as follows:

 //3秒之后自动执行go方法，直接跳转到index.jsp页面

Method 3:

The flaw of the above two examples is that they can realize the jump, but they don’t know when to jump. To realize the countdown 3-2-1;

The settimeout method can no longer be done;

setInterval evaluates an expression after every specified millisecond value.

After the same time has passed, the corresponding function will be executed. Specific implementation method:

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