You don’t need an onload event. Just setInterval() with a function which will set a new value in a div:
function autoRefreshDiv() {
  document.getElementById("people").innerHTML = Math.random();
}
setInterval(autoRefreshDiv, 1000);  // Time is set in milliseconds<div id="people"></div>setInterval will run the function every X milliseconds.
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solved Div with random values that change with time