Js tool method - different generates a random number

function generateRandom(count, max) {
	var arr = [];
	for(var i=0;i<count;i++){
		do {
			var flag = true
			let item = Math.round(Math.random() * max);
			if (arr.indexOf(item) == -1) {
				arr.push(item)
				flag = false
			}
		}while (flag);
	}
	return arr
}