                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JS动画效果

页面没有反应

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>链式运动框架</title>
<style type="text/css">
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 type="js/move.js"></script>
<script>
window.onload=function(){
var Li=document.getElementById("li1");
Li.onmouseover=function(){
startMove(Li,"width",400,function(){
startMove(Li,"height",200,function(){
startMove(Li,"opacity",100);
});
});
};

Li.onmouseout=function(){
startMove(Li,"opacity",30,function(){
startMove(Li,"height",100,function(){
startMove(Li,"width",200);
});
});
};

};
</script>
</head>
<body>
<ul>
<li id="li1"></li>
</ul>
</body>
</html>

js/move.js

function getStyle(obj,attr){
	if(obj.currentStyle){
		return obj.currentStyle[attr];
	}else{
		return getComputedStyle(obj,false)[attr];
	}
}

function startMove(obj,attr,iTarget,fn){
	clearInterval(obj.timer);
	obj.timer=setInterval(function(){
		//获取当前属性值
		var icur;
		if(attr=="opacity"){
			icur=Math.round(parseFloat(getStyle(obj,attr))*100);
		}else{
			icur=parseInt(getStyle(obj,attr));
		}
		//计算变化速度
		var speed=(iTarget-icur)/8;
		speed=speed>0?Math.ceil(speed):Math.floor(speed);
		//检测停止
		if(icur==iTarget){
			clearInterval(obj.timer);
			if(fn){ //当某一动画结束时，如果有回调函数，则执行
				fn();
			}

		}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);
}