Tutorial Call Function with Random Timer

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function randRange(data) {
       var newTime = data[Math.floor(data.length * Math.random())];
       return newTime;
}

function toggleSomething() {
       var timeArray = new Array(200, 300, 150, 250, 2000, 3000, 1000, 1500);

       // do stuff, happens to use jQuery here (nothing else does)
       $("#box").toggleClass("visible");

       clearInterval(timer);
       timer = setInterval(toggleSomething, randRange(timeArray));
}

var timer = setInterval(toggleSomething, 1000);
// 1000 = Initial timer when the page is first loaded

View Demo

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