setTimeout与setInterval

setInterval

 1 var num = 0;
 2 var max = 10;
 3 var intervalId = null;
 4 
 5 function incrementNumber() {
 6     num++;
 7 
 8     if (num == max) {
 9         clearInterval(intervalId);
10         console.log("Done");
11     }
12 }
13 
14 intervalId = setInterval(incrementNumber, 500);

setTimeout

 1 var num = 0;
 2 var max = 10;
 3 
 4 function incrementNumber() {
 5     num++;
 6     console.log(num);
 7 
 8     if (num < max) {
 9         setTimeout(incrementNumber, 500);
10     } else {
11         console.log("Done");
12     }
13 }
14 
15 setTimeout(incrementNumber, 500);