setTimeout与setInterval

setInterval

var num = 0;
var max = 10;
var intervalId = null;

function incrementNumber() {
    num++;

    if (num == max) {
        clearInterval(intervalId);
        console.log("Done");
    }
}

intervalId = setInterval(incrementNumber, 500);

setTimeout

var num = 0;
var max = 10;

function incrementNumber() {
    num++;
    console.log(num);

    if (num < max) {
        setTimeout(incrementNumber, 500);
    } else {
        console.log("Done");
    }
}

setTimeout(incrementNumber, 500);