Unref of and ref of usage examples for setTimeout and setInterval in javascript

The usage of unref() and ref() is very simple, which is to cancel and reply to setTimeout and setInterval function.

The code is as follows:

 var testFunction=function(){

     console.log("guoyansi");

 }

 var timer=setInterval(testFunction,1000);

 timer.unref();//Cancel the setTimeout and setInterval function with 

 timer.ref();//Restore the setTimeout and setInterval function with 

Is not super simple, if you do not understand, please let go of javascript ~