自定义滚动条的实现
效果：
实现：
<!DOCTYPE html> <html lang=""> <head> <meta charset="utf-8"> <title></title> <style> * {margin: 0;padding: 0;} html,body { width: 100%;height: 100%;} #box { width: 100%; height: 100%; overflow: hidden;} /*一个个划过去的页面块*/ .ball { width: 100%; height: 500px; font-size:100px; font-weight:bold; color: skyblue; text-align: center; line-height:500px; } /*//滚动栏*/ #scroll { width: 20px; height: 96%; position: fixed; top: 2%; right: 5px; border-radius: 10px; background-color: rgba(235, 233, 233, 0.5); z-index: 9998; opacity: 0; } /*//滚动栏上的小长条*/ #scrollBar { position: absolute; z-index: 1;/*//定在上面*/ width: 20px; height: 40px; border-radius: 10px; left: 0; top: 0; background-color: red;opacity: 0.6; } </style> </head> <body> <div> <div> <!--//营造div色块交替的感觉--> <p>1</p> <p>2</p> <p>3</p> <p>4</p> <p>5</p> <p>6</p> </div> </div> <div> <div></div> </div> </body> </html> <script type="text/javascript"> var content = document.getElementById("content"); var box = document.getElementById("box"); var scroll = document.getElementById("scroll"); var scrollBar = document.getElementById("scrollBar"); var Step = { value : 0, size : 20, maxVal : Math.ceil((content.offsetHeight-document.body.offsetHeight)/20), getCurrentVal:function(){ return this.value; }, next:function(){ if(this.value==this.maxVal) return; this.value++; }, pre:function(){ if(this.value==0) return; this.value--; }, getDistance:function(){ return this.getCurrentVal()*this.size; }, update:function(){ this.maxVal = Math.ceil((content.offsetHeight-document.body.offsetHeight)/this.size); } } window.addEventListener("resize",function(){ Step.update(); }); box.addEventListener("DOMMouseScroll",scrollfunc); box.addEventListener("mousewheel", scrollfunc); function scrollfunc(e){ if(e.type=="mousewheel"){ //非FF e.wheelDelta<0?Step.next():Step.pre(); } else { //FF e.detail>0?Step.next():Step.pre(); } document.title = Step.getCurrentVal(); box.scrollTop = Math.min(Step.getDistance(),content.offsetHeight-document.body.offsetHeight); //计算滚动比例 var percent = box.scrollTop/(content.offsetHeight-document.body.offsetHeight); //显示滚动条 scroll.style.opacity = 100; //计算滚动条的位置 scrollBar.style.top = (scroll.offsetHeight-scrollBar.offsetHeight)*percent + "px"; } </script>