Detailed explanation of javascript timer_javascript skills

Timer

Basic format:

Copy code The code is as follows:

setInterval(function(){code},1000);

/*

Note: 1.setInterval will return a timer ID value

You can receive it like this. var setId = setInterval(....);

2. The purpose of receiving setId is to clear the timer.

clearTimeout(setId);

*/

For example

One-shot timer

Format:

Copy code The code is as follows:

​​​ setTimeout(function(){code},1000)

Case:

Copy code The code is as follows:

         var setId = setTimeout(function(){
alert('Only executed once');
},1000);

Title scrolling case

Copy code The code is as follows:

setInterval(function(){
var tit =document.title;
//1~length 0
Document.title = tit.substring(1) tit.substring(0,1);
},1000);

I hope that friends can gain a new understanding of javascript timers through this article. If you have any questions, please leave me a message.