requestidlecallback

requestidlecallback_test.js

//forked from "https://developer.mozilla.org/en-US/docs/Web/API/Background_Tasks_API"
window.requestIdleCallbackCustom = function(handler) {
  let startTime = Date.now();
  
  return setTimeout(function() {
    handler({
      didTimeout: false,
      timeRemaining: function() {
        return Math.max(0, 50.0 - (Date.now() - startTime));
      }
    });
  }, 1);
}

requestIdleCallbackCustom(function myhandler(obj)  {
    let result = 0;
    for(let i=0; i<999999; i++) {result += Math.random()}
    let timeremain = obj.timeRemaining();
    console.log("1=>", timeremain);

    if(timeremain < 10) return;

    requestIdleCallbackCustom(function myhandler(obj)  {
    	let result = 0;
    	for(let i=0; i<100; i++) {result += Math.random()}
    	let timeremain = obj.timeRemaining();
    	console.log("2=>", timeremain);
	});

});