//speed scrolling speed time interval
function gotoTop(speed,time){
speed = speed || 0.1;
time = time || 16;
// The horizontal distance from the scroll bar to the top of the page
var x = ;
// Vertical distance from the scroll bar to the top of the page
var y = ;
// Scroll distance = Current distance / speed, because the distance is smaller and the speed is greater than 1, so the scroll distance will become smaller and smaller
speed++;
((x / speed), (y / speed));
// If the distance is not zero, continue to call the iterative function
if(x > 0 || y > 0) {
("gotoTop(" + speed + ", " + time + ")", time);
}
}