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/JavaScript
/JS動畫效果
想看看源代碼，怎么沒有這一節(jié)的源代碼？
2017-03-14
源自：JS動畫效果 4-2
正在回答
```js
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>任意屬性值2</title>
<style>
body, ul, li {
margin: 0;
padding: 0;
}
ul,li {
list-style: none;
ul li {
width: 200px;
height: 100px;
background: yellow;
margin-bottom: 20px;
border: 4px solid #000;
filter: alpha(opacity: 30);
opacity: 0.3;
</style>
<script>
window.onload = function() {
/*var aLi = document.getElementsByTagName('li');
for(var i=0;i<aLi.length;i++){
aLi[i].timer = null;
aLi[i].onmouseover = function() {
startMove(this,400);
aLi[i].onmouseout = function() {
startMove(this,200);
}*/
var Li1 = document.getElementById('li1');
var Li2 = document.getElementById('li2');
Li1.onmouseover = function() {
startMove(this,'opacity',100);
Li1.onmouseout = function() {
startMove(this,'opacity',30);
// var timer = null;
function getStyle(obj,attr) {
if(obj.currentStyle) {
// IE
return obj.currentStyle[attr];
}else{
// Firefox
return getComputedStyle(obj,false)[attr];
var alpha = 30;
function startMove(obj,attr,iTarget){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var icur = 0;
if(attr == 'opacity') {
icur = Math.round(parseFloat(getStyle(obj,attr))*100);
icur = parseInt(getStyle(obj,attr));
var speed = (iTarget-icur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(icur == iTarget) {
obj.style.filter = 'alpha(opacity:'+(icur+speed)+')';
obj.style.opacity = (icur+speed)/100;
obj.style[attr] = icur + speed + 'px';
},30)
</script>
</head>
<body>
<ul>
<li id="li1"></li>
</ul>
</body>
</html>
```
舉報
通過本課程JS動畫的學習，從簡單動畫開始，逐步深入各種動畫框架封裝
1 回答求這節(jié)課的源碼
1 回答請問這段代碼錯在哪里
2 回答源代碼 從哪里下載 各位老師講一下嗎
1 回答求解這段代碼的問題在哪？
1 回答請問源碼在那里？
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2017-03-14
```js
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>任意屬性值2</title>
<style>
body, ul, li {
margin: 0;
padding: 0;
}
ul,li {
list-style: none;
}
ul li {
width: 200px;
height: 100px;
background: yellow;
margin-bottom: 20px;
border: 4px solid #000;
filter: alpha(opacity: 30);
opacity: 0.3;
}
</style>
<script>
window.onload = function() {
/*var aLi = document.getElementsByTagName('li');
for(var i=0;i<aLi.length;i++){
aLi[i].timer = null;
aLi[i].onmouseover = function() {
startMove(this,400);
}
aLi[i].onmouseout = function() {
startMove(this,200);
}
}*/
var Li1 = document.getElementById('li1');
var Li2 = document.getElementById('li2');
Li1.onmouseover = function() {
startMove(this,'opacity',100);
}
Li1.onmouseout = function() {
startMove(this,'opacity',30);
}
}
// var timer = null;
function getStyle(obj,attr) {
if(obj.currentStyle) {
// IE
return obj.currentStyle[attr];
}else{
// Firefox
return getComputedStyle(obj,false)[attr];
}
}
var alpha = 30;
function startMove(obj,attr,iTarget){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var icur = 0;
if(attr == 'opacity') {
icur = Math.round(parseFloat(getStyle(obj,attr))*100);
}else{
icur = parseInt(getStyle(obj,attr));
}
var speed = (iTarget-icur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(icur == iTarget) {
clearInterval(obj.timer);
}else{
if(attr == 'opacity') {
obj.style.filter = 'alpha(opacity:'+(icur+speed)+')';
obj.style.opacity = (icur+speed)/100;
}else{
obj.style[attr] = icur + speed + 'px';
}
}
},30)
}
</script>
</head>
<body>
<ul>
<li id="li1"></li>
</ul>
</body>
</html>
```