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滚动条.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Author" content=" ">
<title>Document</title>
<style type="text/css">
*{margin: 0;padding: 0;}
a{text-decoration: none;color: #333;}
ul,li{list-style: none;}
body{font-size: 14px;font-family: "微软雅黑";}
body{font-size: 14px;font-family: "微软雅黑";-webkit-user-select:none;-moz-user-select:none;user-select:none;}
#box{width: 700px;height: 500px;background: #FCF3B4;margin: 30px auto;padding: 20px;font-size: 16px;color: #333;position: relative;overflow: hidden;}
.pbold{font-size: 20px;font-weight: bold;font-family: "Vivaldi"}
#scrollBar{width: 20px;height: 100%;border-radius:10px;background: linear-gradient(#84E7F4,#F164F4);position: absolute;top: 0;right: 0;}
#bar{width: 20px;height: 50px;background: #333;border-radius:10px;position: absolute;top: 0;right;z-index: 2}
#b_over{width: 100%;height: 100%;background: transparent;position: absolute;top: 0;right;z-index: 1}
#content{position: relative;}
</style>
</head>
<body>
<div id="box">
<div id="scrollBar">
<div id="bar"></div>
<div id="b_over"></div>
</div>
<div id="content">
<h2>阿甘正传</h2>
<br/>
<p class="pbold">1、Life was like a box of chocolates, you never know what you're going to get.</p>
<p>生命就像一盒巧克力，结果往往出人意料。</p>
<p class="pbold">2、Stupid is as stupid does.</p>
<p>蠢人做蠢事，也可理解为傻人有傻福。</p>
<p class="pbold">3、Miracles happen every day.</p>
<p>奇迹每天都在发生。</p>
<p class="pbold">4、it made me look like a duck in water.</p>
<p>它让我如鱼得水。</p>
<p class="pbold">5、I don't know if we each have a destiny, or if we're all just floating around accidental—like on a breeze.</p>
<p>我不懂我们是否有着各自的命运，还是只是到处随风飘荡。</p>
<p class="pbold">6、Death is just a part of life, something we're all destined to do.</p>
<p>死亡是生命的一部分，是我们注定要做的一件事。</p>
<p class="pbold">7、You have got to put the past behind you before you can move on.</p>
<p>放下包袱，继续前进。</p>
<p class="pbold">8、It was like just before the sun goes to bed down on the bayou. There was a million sparkles on the river.</p>
<p>就像太阳在落山前映射在河口上，有无数的亮点在闪闪发光。</p>
<p class="pbold">9、If there is anything you need, I will not be far away.</p>
<p>只要你需要，我就在这里。</p>
<p class="pbold">10、I am a man of my word.</p>
<p>我是信守承诺的人。</p>
<p class="pbold">11、There is one small step for a man,a giant leap for mankind.</p>
<p>某人的一小步就是人类的一大步。</p>
</div>
</div>
<script type="text/javascript">
function wheel(el,callBack){
var fn = function(){
var e = arguments[0];
var w = e.wheelDelta || -e.detail;
if(!e.mark)e.mark = null;
if(w > 0){
e.mark = true;
return callBack.apply(el,arguments);
}else if(w < 0){
e.mark = false;
return callBack.apply(el,arguments);
};
};
if(el.onmousewheel === null){
el.onmousewheel = fn;
}else{
el.addEventListener('DOMMouseScroll',fn);
};
};
~function($){
if(document.addEventListener){
$.bind = function(el,type,fn){
el.addEventListener(type,fn);
el['ev'+type] = el['ev'+type] || [];
el['ev'+type].push(fn);
return fn;
};
$.off = function(el,type,fn){
if(typeof fn != 'undefined'){
el.removeEventListener(type,fn);
}else{
el['ev'+type].forEach(function(item){
el.removeEventListener(type,item);
})
}
};
}else{
$.bind = function(el,type,fn){
var foo = function(){
// 改变this指向 同时把event对象传递出去
return fn.apply(el,arguments);
};
el.attachEvent('on'+type,foo);
el['ev'+type] = el['ev'+type] || [];
el['ev'+type].push(foo);
return foo;
};
$.off = function(el,type,fn){
if(typeof fn != 'undefined'){
el.detachEvent('on'+type,fn);
}else{
el['ev'+type].forEach(function(item){
el.detachEvent(type,item);
});
};
};
}
}(window);
/*
1. 拖拽事件
考虑一个方向 竖直
2. 点击事件
click会触发mousedown
3. 滚轮事件
*/
var bar = document.getElementById("bar"),
content = document.getElementById("content"),
scrollBar = document.getElementById("scrollBar"),
overDom = document.getElementById("b_over"),
box = document.getElementById("box"),
maxH = scrollBar.offsetHeight - bar.offsetHeight,
conH = content.offsetHeight - maxH;
// 拖拽事件
bind(bar,'mousedown',function(e){
var e = e || window.event;
var y = e.pageY - this.offsetTop;
bind(document,'mousemove',function(e){
var e = e || window.event;
var ctop = e.pageY - y;
ctop = Math.min(ctop,maxH);
ctop = Math.max(0,ctop);
bar.style.top = ctop + 'px';
content.style.top = -(ctop / maxH) * conH + 'px';
// ctop / maxH = x / contentHeight
});
bind(document,'mouseup',function(){
off(document,'mousemove');
off(document,'mouseup');
});
});
// 点击事件
bind(overDom,'click',function(e){
var e = e || window.event;
var ctop = e.pageY - box.offsetTop - bar.offsetHeight;
ctop = Math.min(ctop,maxH);
ctop = Math.max(0,ctop);
bar.style.top = ctop + 'px';
content.style.top = -(ctop / maxH) * conH + 'px';
});
wheel(box,function(e){
e.preventDefault();
var barTop = bar.offsetTop;
if(e.mark){
barTop -= 20;
}else{
barTop += 20;
};
barTop = Math.min(barTop,maxH);
barTop = Math.max(0,barTop);
bar.style.top = barTop + 'px';
content.style.top = -(barTop / maxH) * conH + 'px';
});
</script>
</body>
</html>