<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#div1 {
width: 100px;
height: 100px;
background: red;
filter: alpha(opacity=30);
opacity: 0.3;
}
</style>
<script>
window.onload = function () {
var oDiv = document.getElementById('div');
var i = 0;
oDiv.timer = null;
oDiv.onmouseover = function () {
startMove(oDiv, 'opacity', 100)
}
oDiv.onmouseout = function () {
startMove(oDiv, 'opacity', 30)
}
}
function getStyle(obj, attr) {
if (obj.currentStyle) {
return obj.currentStyle[attr];
} else {
return getComputedStyle(obj, false)[attr];
}
}
function startMove(obj, attr, iTarget) {
clearInterval(obj.timer);
obj.timer = setInterval(function () {
var iCur = 0;
if (atrr == 'opacity') {
iCur == parseInt(parseFloat(getStyle(obj, attr)) * 100);
} else {
iCur == parseInt(getStyle(obj, attr));
}
var iSpeed = (iTarget - iCur) / 8;
iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
if (iCur == iTarget) {
clearInterval(obj.timer);
} else {
if (attr == 'opacity') {
obj.style.filter = 'alpha(opacity=' + (iCur + iSpeed) + ')'; //优先级
obj.style.opacity = (iCur + iSpeed) / 100;
} else {
obj.style[attr] = iCur + iSpeed + 'px';
}
}
}, 30)
}
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>
写代码不认真，又不懂看浏览器错误信息
window.onload = function () {
var oDiv = document.getElementById('div1');//-----------少 1
var i = 0;
oDiv.timer = null;
oDiv.onmouseover = function () {
startMove(oDiv, 'opacity', 100)
}
oDiv.onmouseout = function () {
startMove(oDiv, 'opacity', 30)
}
}
function getStyle(obj, attr) {
if (obj.currentStyle) {
return obj.currentStyle[attr];
} else {
return getComputedStyle(obj, false)[attr];
}
}
function startMove(obj, attr, iTarget) {
clearInterval(obj.timer);
obj.timer = setInterval(function () {
var iCur = 0;
if (attr == 'opacity') {//---------------你写成 atrr
iCur = parseInt(parseFloat(getStyle(obj, attr)) * 100);//---------------赋值是一个 =
} else {
iCur = parseInt(getStyle(obj, attr));//--------------------赋值是一个 =
}
var iSpeed = (iTarget - iCur) / 8;
iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
if (iCur == iTarget) {
clearInterval(obj.timer);
} else {
if (attr == 'opacity') {
obj.style.filter = 'alpha(opacity=' + (iCur + iSpeed) + ')'; //优先级
obj.style.opacity = (iCur + iSpeed) / 100;
} else {
obj.style[attr] = iCur + iSpeed + 'px';
}
}
}, 30)
}
建议换一个浏览器试试，可能是浏览器默认属性的问题