为什么没效果呢

源自：2-2 JS透明度动画

为什么没效果呢

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style type="text/css">
body {margin:0;}
.divs {
	width:200px;
	height:200px;
	background: red;
	opacity:0.3;
	filter:alpha(opacity:30);
	cursor:pointer;
	}
</style>
<script type="text/javascript">

window.onload = function(){
	var timer = null;
	var apa = 30;
	var oDiv=document.getElementsByClassName("divs")[0];
	function Alphas (iTarget){
	
		clearInterval(timer);
		var Speed = 0;
			if(iTarget>apa){
				Speed = 10;
			}else if(iTarget<apa){
				Speed = -10;	
			}
		
		timer = setInterval(function(){
			if(apa ==iTarget){
				clearInterval(timer)	
			}else{
				apa+=Speed;
				oDiv.style.opacity = apa/100;
				oDiv.style.filter="alpha(opacity:"+apa+")";
				//console.log(apa);
			}
		},20)
	oDiv.onmouseover=function(){
		Alphas(100);		
	}
	oDiv.onmouseout=function(){
		Alphas(30);	
	}	
	}
}

</script>
</head>

<body>
<div class="divs"></div>
</body>
</html>

为什么移入移出都没效果呢？怎么也找不到问题在哪也不报错

提问者：HAIM 2016-07-11 19:24

个回答

lhb3604072

2016-07-11 21:45:21

已采纳

挺多错误的，最致命的错误是把所有的定义函数放在widow.onload下了，其次定时器也错了
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style type="text/css">
body {margin:0;}
#divs {
width:200px;
height:200px;
background:red;
opacity:0.3;
filter:alpha(opacity:30);
cursor:pointer;
}
</style>
<script type="text/javascript">

window.onload = function(){
var oDiv=document.getElementById('divs');
oDiv.onmouseover=function(){
Alphas(100);
}
oDiv.onmouseout=function(){
Alphas(30);
}
}

var timer = null;
var apa = 30;
function Alphas (iTarget){
clearInterval(timer);
var oDiv=document.getElementById('divs');

timer= setInterval(function(){ //定时器
var Speed = 0;
if(iTarget>apa){
Speed = 10;
}else if(iTarget<apa){
Speed = -10;
}
if(apa ==iTarget){
clearInterval(timer)
}else{
apa+=Speed;
oDiv.style.opacity = apa/100;
oDiv.style.filter="alpha(opacity:"+apa+")";
//console.log(apa);
}
},20)

}

</script>
</head>

<body>
<div id="divs"></div>
</body>
</html>

0
qq_奋斗的我_03498945

2016-10-16 22:33:17

var oDiv=document.getElementsByClassName("divs")[0];你这句话错了

0