The scroll bar responds to the mouse pulley event to realize the up and down scrolling code

Implement mouse scrolling wheel event:

 <script type="text/javascript"> var scrollFunc=function(e){ e=e || window.event; if(e.wheelDelta){//IE/Opera/Chrome if(e.wheelDelta==120) { //Scroll up event alert(e.wheelDeta +"up"); }else { //Scroll up event alert(e.wheelDeta +"up"); } }else if(e.detail){ //Firefox if(e.detail==-3) { //Scroll up event<br> alert(e.detail +"up"); }else { //Scroll down event<br> alert(e.detail +"down"); } } } }; if(document.addEventListener){ //adding the event listener for Mozilla document.addEventListener("DOMMouseScroll" ,scrollFunc, false); } //IE/Opera/Chrome window.onmousewheel=document.onmousewheel=scrollFunc;</script>