javascript - Why is the method executed immediately when I use setTimeout?

Question

I'm trying to write a simple code with a setTimeout, but the setTimeout just won't wait the time it's supposes to and the code execute immediately. What am I doing wrong?

setTimeout(testfunction(), 2000);

question from:https://stackoverflow.com/questions/65906112/setinterval-in-this-react-code-doesnt-work-i-just-get-time-once

Answer 1

You're calling the function immediately and scheduling its return value.

Use:

setTimeout(testFunction, 2000);
                       ^

Notice: no parens.