setInterval()
When a function
is called for a specified period of time:

setInterval(function,time,lang)

function: function to be called or code string to be executed
time: required parameters, every how long to call the function, in milliseconds
lang: optional parameters, running JScript | VBScript | JavaScript
clearInterval()
Means to stop the setInterval timer call function

function getTime() {
        console.log(123);
        if (true) {
            clearInterval(db)
        }
    }

let db = setInterval(getTime, 1000)

setTimeout()
Call a function after a certain time
syntax:

setTimeout(function,time,lang)

Function:
function: required, to be called
time: required, number of milliseconds to wait before executing code
lang: optional, script language: JScript | VBScript | JavaScript