JS滚动条 JS自定义滚动条效果
李尚书 人气:0
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#all{
width: 500px;
height: 50px;
background-color: sandybrown;
border-radius: 25px;
margin: 0 auto;
position: relative;
}
#div1{
width: 50px;
height: 50px;
border-radius: 50%;
background-color: rosybrown;
position: absolute;
}
#box{
background-color: yellow;
position: absolute;
top: 200px;
left: 200px;
}
</style>
</head>
<body>
<div id="all">
<div id="div1"></div>
</div>
<div id="box"></div>
<script type="text/javascript">
var oAll = document.getElementById("all");
var oDiv1 = document.getElementById("div1");
var oBox = document.getElementById("box");
var maxL = oAll.clientWidth - oDiv1.offsetWidth;
oDiv1.onmousedown = function(){
var ev = ev || window.event;
var lessX = ev.clientX - oDiv1.offsetLeft;
document.onmousemove = function(){
var ev = ev || window.event;
var posL = ev.clientX - lessX;
if(posL<0){
posL = 0;
}
if(posL>maxL){
posL = maxL;
}
oDiv1.style.left = posL + "px";
//滚动条移动的百分比
//oDiv1.offsetLeft/maxL
var per = posL/maxL;
//定义宽0~300
oBox.style.width = 300*per+"px";
oBox.style.height = 300*per+"px";
oBox.style.marginTop = -oBox.offsetHeight/2+"px";
oBox.style.marginLeft = -oBox.offsetWidth/2+"px";
}
}
document.onmouseup =function(){
document.onmousemove = null;
}
</script>
</body>
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