如何跳出 javascript 中的函数

Question

If I have something like this:

var x = 1;
setInterval(function(){
    if (x == "1") {x = "2"};
    if (x == "2") {x = "3"};
    if (x == "3") {x = "1"};
}, 250);

At the moment, the function runs the first if since it is inherintly true, then since the first if alters x to meet the conditions of the second if , it runs that as well, then does the same with the third and sets x all the way back to 1 How do I get each of the if functions to break out of the setInterval funtion so that after it has ran, the other if s will not run?
I've found how to do this with loops but not for functions. I understand that the above function would probably be better suited in a loop, but it's only an example for the sake of keeping the question short.

Answer 1

Use a ternary expression for this simple case:

 var x = 1; var interval = setInterval(function() { x < 3 ? x++ : x=1 console.log(x) }, 250); // clears the interval after 5000 ms setTimeout(function() { clearInterval(interval) }, 5000);