JavaScript back to the top effect of the implementation code

This article is mainly to the JavaScript back to the top effect of the implementation code is introduced, need friends can come to the reference, I hope to help you

The code is as follows://speed scrolling speed time interval function gototop (speed,time) {speed = Speed | | 0.1; Time = Time | |       16;       The horizontal distance of the scroll bar to the top of the page var x = document.body.scrollLeft;       The vertical distance of the scroll bar to the top of the page var y = document.body.scrollTop;      Rolling distance = current distance/speed, because the smaller the distance, the speed is greater than 1 of the number, so the rolling distance will be more and more small speed++;       Window.scrollto (Math.floor (x/speed), Math.floor (Y/speed)); If the distance is not zero, continue to invoke the iteration this function if (x > 0 | | | y > 0) {window.settimeout ("Gototop + Speed +", "+ Time +") ", t     IME); } }