鼠标滚轮
IE/Chrome : onmousewheel
event :wheelDelta 数字类型
滚轮往上走就是:120
滚轮往下走就是-120
标准下面event.detail永远都是0,非标准IE的event.detail都是undefined
ff: DOMMouseScroll 必须用addEventListener来实现绑定
evnet.detail
滚轮往上走:就是-3
滚轮往下走:就是3return false阻止的是obj.on事件名称=fn所触发的默认行为,阻止不了addEventListener绑定行为
用addEventListener绑定的事件需要通过event下面的preventDefault()来阻止默认行为
IE下面用attachEvent来绑定的话,还是可以用return false来阻止默认事件
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
#div1 {width: 100px; height: 100px; background: red;}
</style>
<script>
/*
鼠标滚轮事件
*/
window.onload = function() {
var oDiv = document.getElementById('div1');
/*
ie/chrome : onmousewheel
event.wheelDelta
上:120
下:-120
firefox : DOMMouseScroll 必须用addEventListener
event.detail
上:-3
下:3
return false阻止的是 obj.on事件名称=fn 所触发的默认行为
addEventListener绑定的事件需要通过event下面的preventDefault();
*/
oDiv.onmousewheel = fn;
if (oDiv.addEventListener) {
oDiv.addEventListener('DOMMouseScroll', fn, false);
}
function fn(ev) {
var ev = ev || event;
var b = true;
if (ev.wheelDelta) {
b = ev.wheelDelta > 0 ? true : false;
} else {
b = ev.detail < 0 ? true : false;
}
if ( b ) {
this.style.height = this.offsetHeight - 10 + 'px';
} else {
this.style.height = this.offsetHeight + 10 + 'px';
}
if (ev.preventDefault) {
ev.preventDefault();
}
return false;
}
}
</script>
</head>
<body style="height: 2000px;">
<div id="div1"></div>
</body>
</html>
封装成插件
<script>
/*
鼠标滚轮事件
*/
mousewheel(document.getElementById("div1"),function(){console.log("向下滚")},function(){console.log("向上滚")});
function mousewheel(obj,downfn,upfn)
{
obj.onmousewheel = fn;
if (obj.addEventListener) {
obj.addEventListener('DOMMouseScroll', fn, false);
}
function fn(ev) {
var ev = ev || event;
var b = true;
if (ev.wheelDelta) {
b = ev.wheelDelta > 0 ? true : false;
} else {
b = ev.detail < 0 ? true : false;
}
if(b) {
upfn&&upfn();
} else {
downfn&&downfn();
}
if (ev.preventDefault) {
ev.preventDefault();
}
return false;
}
}
</script>