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Front-end practice--JavaScript--animation (2)

黄舟Original: 2016-12-30 16:29:081006browse

Transparency Animation

Achieve the effect: when moved to the picture several times. The image has a gradient effect; when the mouse leaves, the original image effect is restored.

Answer:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>透明度动画</title>
    <style type="text/css">
        *{
            margin:0;
            padding:0;
        }
        #div1{
            width:200px;
            height:200px;
            background:red;
            filter:alpha(opacity:30);
            opacity:0.3;            
        }
    </style>
    <script>
        window.onload = function(){
            var oDiv = document.getElementById(&#39;div1&#39;);
            oDiv.onmouseover = function(){
                startMove(100);
            }
            oDiv.onmouseout = function(){
                startMove(30);
            }
        }
        var timer = null;
        var alpha = 30;
        function startMove(iTarget){
            var oDiv = document.getElementById(&#39;div1&#39;);
            clearInterval(timer);
            timer = setInterval(function(){
                var speed = 0;
                if(alpha > iTarget){
                    speed = -10;
                }else{
                    speed = 10;
                }
                if(alpha == iTarget){
                    clearInterval(timer);
                }else{
                    alpha = alpha + speed;
                    oDiv.style.filter = &#39;alpha(opacity:&#39;+alpha+&#39;)&#39;;
                    oDiv.style.opacity = alpha/100;
                }
            },30)
        }
    </script>
</head>

<body>
    <div id="div1"></div>
</body> 
</html>

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