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                        /前端开发
                        
                            /JavaScript
                        
                        /JS动画效果

我的跟老师写的一样,但是没有变大的效果,怎么回事?

<style>

* { margin:0px; padding:0px;}

.top { width:200px; overflow:hidden; float:left;}

.top ul {width:200px; overflow:hidden; float:left; }

.top ul li { width:200px; height:100px; background:#ffd800; float:left; margin-bottom:20px;}

</style>

window.onload = function () {

var count = document.getElementsByTagName("li");

for (var i = 0; i < count.length; i++) {

count[i].onmouseover = function () {

startMove(this, 400);

}

count[i].onmouseout = function () {

startMove(this, 200);

}

var time = null;

function startMove(obj, end) {

clearInterval(time);

time = setInterval(function () {

var speed = (end - obj.offsetWidth) / 8;

speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);

if (obj.offsetWidth == end) {

clearInterval(time);

} else {

obj.style.width = obj.offsetWidth + speed + 'px';

}

}, 30)

}

</script>

<body>

<ul>

</ul>

</div>

哪位小伙伴能帮我看看,非常感谢

好雪君

2015-10-27

源自：JS动画效果 4-1

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3 回答

Aurora丶回答被采纳 +3 积分
2015-10-31

这个代码的完整答案是这样的

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>demo</title>
<style type="text/css">
*{margin: 0;padding: 0;}
ul{list-style-type: none;}
ul li{width: 200px;height: 100px;background: yellow;margin-bottom: 20px;}
</style>
<script type="text/javascript">
window.onload = function(){
var oLi = document.getElementsByTagName('li');
for(var i = 0 ; i < oLi.length ; i++){
oLi[i].timer = null;
oLi[i].onmouseover = function(){
starMove(this,400);
}
oLi[i].onmouseout = function(){
starMove(this,200);
}
}
}
function starMove(obj,iTarget){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var speed = (iTarget - obj.offsetWidth)/5;
speed=speed>0 ? Math.ceil(speed):Math.floor(speed); 
if (obj.offsetWidth == iTarget) {
clearInterval(obj.timer);
}else{
obj.style.width = obj.offsetWidth + speed + "px";
}
},30)
}
</script>
</head>
<body>
<ul>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>