js 捕捉滾輪的滾動
阿新 • • 發佈：2018-11-02
滾動方向區分為正負：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
window.onload = function(){
//去掉預設的contextmenu事件，否則會和右鍵事件同時出現。
document.oncontextmenu = function(e){
e.preventDefault();
};
document.getElementById("test").onmousedown = function(e){
if(e.button ==2){
alert("你點了右鍵");
}else if(e.button ==0){
alert("你點了左鍵");
}else if(e.button ==1){
alert("你點了滾輪");
}
}
}
</script>
</head>
<body>
<label for="wheelDelta">滾動值:</label>(IE/Opera)<input type="text" id="wheelDelta"/>
<label for="detail">滾動值:(Firefox)</label><input type="text" id="detail"/>
<script type="text/javascript">
var scrollFunc=function(e){
ee=e || window.event;
var t1=document.getElementById("wheelDelta");
var t2=document.getElementById("detail");
if(e.wheelDelta){//IE/Opera/Chrome
t1.value=e.wheelDelta;
}else if(e.detail){//Firefox
t2.value=e.detail;
}
}
/*註冊事件*/
if(document.addEventListener){
document.addEventListener('DOMMouseScroll',scrollFunc,false);
}//W3C
window.onmousewheel=document.onmousewheel=scrollFunc;//IE/Opera/Chrome
</script>
<div style="width: 400px;height:400px;margin:auto;border:1px solid pink" id="test"></div>
</body>
</html>