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HomeWeb Front-endJS TutorialCustom scroll bars: separate implementation steps for html, css, and js code

HTML structure

<p class="content" id="content">
		<p class="con-scroll" id="countent">
			js对于鼠标滚轮事件的监听
			<br>
			2017年08月25日 18:17:56
			<br>
			阅读数:10072
			<br>
			需求:
			<br>

			通过鼠标滚轮实现某个表单内的数字增加减少操作,或者滚轮控制某个按钮的上下滚动后触发不同的事件。

			<br>
			实现:
			<br>

			通过js对鼠标滚轮的事件进行监听。
			<br>

			描述:
			<br>

			首先,不同的浏览器有不同的滚轮事件。主要是有两种,onmousewheel(firefox不支持)和DOMMouseScroll(只有firefox支持),关于这两个事件这里不做详述,想要了解的朋友请移步:鼠标滚轮(mousewheel)和DOMMouseScroll事件。
			<br>
			具体实现:1. 需要添加事件监听,代码如下:兼容firefox采用addEventListener监听
			<br>



			 /*监听鼠标滚动事件
			 <br>
			         * 1.火狐的是:DOMMouseScroll;
			         <br>
			         * 2.IE/Opera/Chrome:直接添加事件*/
			         <br>
			        if(document.addEventListener){
			        <br>
			            document.addEventListener(&#39;DOMMouseScroll&#39;,scrollFunc,false);
			            <br>
			        }//W3C
			        <br>
			        window.onmousewheel=document.onmousewheel=scrollFunc;//IE/Opera/Chrome
			        <br>

			var scrollFunc=function(e){
			<br>
			            e=e || window.event;
			            <br>
			            if(e.wheelDelta){//IE/Opera/Chrome
			            <br>
			            	//自定义事件:编写具体的实现逻辑
			            	<br>
			                mouseScroll();
			                <br>
			            }else if(e.detail){//Firefox
			            <br>
			            	//自定义事件:编写具体的实现逻辑
			            	<br>
			                mouseScroll();
			                <br>
			            }
			            <br>
			        }
			        <br>

			简要说明:
			<br>
			判断滚轮向上或向下在浏览器中也要考虑兼容性,现在五大浏览器(IE、Opera、Safari、Firefox、Chrome)中Firefox 使用detail,其余四类使用wheelDelta;两者只在取值上不一致,代表含义一致,detail与wheelDelta只各取两个 值,detail只取±3,wheelDelta只取±150,其中正数表示为向下,负数表示向上
			<br>

			版权声明:本文为博主原创文章,未经博主允许不得转载。	https://blog.csdn.net/qq_35647781/article/details/77584977
			<br>
		</p>
		<p class="scroll-wrap" id="wrapScroll">
			<span></span>
		</p>
	</p>

css structure

    .content{
			width: 500px;
			height: 400px;
			border:1px solid;
			overflow: hidden;
			padding:40px;
			margin:50px auto;
			position: relative;
		}
		.scroll-wrap{
			position: absolute;
			width: 10px;
			height: 100%;
			background: #d8d4d4;
			top:0;
			right:0;
		}
		.scroll-wrap span{
			display: block;
			width: 5px;
			height: 100px;
			background: red;
			border-radius: 10px;
			margin:0 auto;
			position: relative;
		}

js code

<script>
		var wrapScroll=document.getElementById("wrapScroll")
		var tapScroll=wrapScroll.getElementsByTagName("span")[0];
		var contentIn=document.getElementById("countent");
		var content=document.getElementById("content")
		tapScroll.onmousedown=function(){
			var e=e||window.event;
			var dowY=e.pageY-this.offsetTop;
			document.onmousemove=function(e){
				var ev=e||window.event;
				var movY=ev.pageY-dowY;
				conmon(movY)
			}
			document.onmouseup=function(){
				document.onmousemove=null;
			}
		}

		content.onmousewheel=function(event){
			var stemp=tapScroll.offsetTop-content.offsetTop+50;
			conmon(stemp)
		}
		function conmon(num){
			var dela=wheel(event)
			num=num<0?0:num;
			var c=wrapScroll.offsetHeight-tapScroll.offsetHeight 	
			dela>0?num-=10:num+=10;			
			num=num>c?c:num
			tapScroll.style.top=num+"px";
			var speed=(contentIn.offsetHeight-content.offsetHeight)/c+0.2;
			console.log(speed)
			contentIn.style.marginTop=-(speed*num)+"px"
		}
		//滚轮事件封装
		function wheel(event){
			var e=event||window.event;
			var delta=0;//次数
			if(e.wheelDelta){
				delta=e.wheelDelta/120;
			}else if(e.detail){
				delta=e.detail/3;
			}
			if(e.preventDefault){
				e.preventDefault()
			}
			return delta
		}
	</script>

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