Summary of JavaScript Timer Types

1.setInterval()

Calls the function at a specified interval (in milliseconds).

The method will keep calling the function until clearInterval() is called or the window is closed.

grammar:

setInterval(code,millisec,[arg1, arg2, ...])

2.setTimeout()

Calls a function after the specified number of milliseconds.

grammar:

setTimeout(code,millisec,[arg1, arg2, ...]); //parameters have the same function as above

Final code demonstration:

//1. You can write setTimeout directly using arrow function(()=>{
 this.isSkeleton=false;
  },2000)
 
//2. You can return a value and then call clearTimeout() to cancel the timer;
let a = setTimeout(()=>{
  alert('popup');
  },5000);
function b() {
  window.clearTimeout(a); // Pop-up window appears after 5 seconds, calling b function can directly cancel the pop-up.}

Return value:

The return value intervalID is a non-zero value used to identify the timer created by setInterval() . This value can be used as a parameter of clearInterval() to clear the corresponding timer. Note that setInterval() and setTimeout() share the same ID pool, so avoid mixing them.

Finally, some knowledge:

JS objects can be obtained in two ways: one is customized by the developer; the other is provided by ECMAScript . The objects provided by ECMAScript are called JavaScript built-in objects.

The timer is provided by window object, and window call can also be added before the timer.

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