How to create pause or delay in FOR loop?

Question

I am working on a website, where I need to create a pause or delay.
So please tell me How to create pause or delay in for loop in javascript or

Answer 1

if you want to create pause or delay in FOR loop,the only real method is

while (true) {
    if( new Date()-startTime >= 2000) {
        break;
    }
}

the startTime is the time before you run the while but this method will cause the browsers become very slow